You actually have the wrong Catherine, as Catherine of Siena is the one this quote is attributed to, and which is not on the Wikipedia page listed. Nor is it on the one for Catherine of Siena:
Even if the Pope were Satan incarnate, we ought not to raise up our heads against him, but calmly lie down to rest on his bosom....
God has commanded that, even if the priests, the pastors, and Christ-on-earth were incarnate devils, we be obedient and subject to them, not for their sakes, but for the sake of God, and out of obedience to Him. (St. Catherine of Siena)
I had part of that quote but was never able to find a original source for it online outside of it it being quoted in in Apostolic Digest by sedevacantist Michael Malone, Book 5, "The Book of Obedience,as KINGS & PRIESTS, and also atrrbuted to St. Catherine of Siena: A Biography By Anne B. Baldwin.
But nuns can be quite familiar with the demonic.
There was "Sister Magdalena of the Cross -The devil's saint for 40 years" with her demonic heavenly visions: http://www.mysticsofthechurch.com/2011/12/sister-magdalena-of-cross-nun-who-made.html
Not long after her fifth birthday, she is praying in Church when she hears music of remarkable sweetness. Then a beautiful young man, with thick, black hair appears to her, wearing a mantle so brilliant that she has to close her eyes. Hearing the story, some believe it to be Jesus. News of this event spreads throughout Córdoba, and many want to see little Magdalena. - See more at: http://www.mysticsofthechurch.com/2011/12/sister-magdalena-of-cross-nun-who-made.html#sthash.pOfzMlwQ.dpuf
...But for now, little Magdalena is living a simple life with her family who were poor artisans, and while Magdalena remains of exemplary modesty and conduct, the visions continue, one after another, and as time goes on this attracts the attention of many; so much so that one day she flees her home to take refuge in a nearby cave, where she once again falls into ecstasy. When she awakens, she discovers that she has been miraculously transported back to her bed by her guardian angel.
Soon, a person whom she believes to be Jesus appears to her and asks her to somewhat moderate her asceticism, so as not to compromise her fragile childhood health. He informs her that a great destiny awaits her, and that she will need her strength. She flies to the church to thank Jesus and on the way meets a man with a severe limp who asks her to lend him her hand to climb the Church steps. He has hardly climbed a few steps when he stands erect and with great surprise and excitement he dashes through the whole town crying out that he is healed!...
In 1497 at the age of ten, Magdalena is already quite beautiful, and in her purity she is very cautious to hide herself under long black dresses and skirts. Even so, she still finds herself too beautiful, and one day for penance she tries to crucify herself on the wall of her bedroom. She starts by nailing her two feet, then her left hand. Blood flows, and she faints from the atrocious pain. Her flesh tears and, falling heavily onto a chest, she breaks two ribs. Her parents call the doctor and he bandages all of her nail wounds, yet she is burning with desire to suffer terribly for the reparation of sins, and she repeatedly takes off the bandages, so as to suffer more. But this soon makes her very ill - See more at: http://www.mysticsofthechurch.com/2011/12/sister-magdalena-of-cross-nun-who-made.html#sthash.pOfzMlwQ.dpuf
On Easter Saturday, 1497, Magdalena is bedridden and seems to be dying, probaly because of infection from the wounds of her failed crucifixion. At midnight, she lets out a great scream, sits up on her bed, once more rips off her dressings, saying that she is healed. She says that it is Jesus himself, who has just appeared to her and has cured her...
Three months before her First Holy Communion, Magdalena seemingly stops eating. The pleadings of her poor parents make no difference; she fasts right up until the Sunday of her first Holy Communion, surprisingly without losing her healthy appearance. On the day of the ceremony, at the precise moment of consecration, she lets out another cry and prostrates herself for a long time. When she exits the church, she explains that the Lord Himself put the Eucharist in her mouth, without her needing to approach the priest
At sixteen, Magdalena contunes to astound many with her apparent extraordinary devotion and her remarkable desire to make reparation for sin. Many see her as a living saint- for who else but a saint could do such extraordinary penances? When she whips herself to bleeding point while doing penance, her wounds are miraculously healed the next day to everyones great surprise. She is healthy, and everything about her seems wholesome, except two fingers which have not grown like the others...
There are however some "red flags" though. She is seemingly not too discrete about her spiritual life and merits; she inflicts severe mortifications upon herself, carries a heavy cross all around the convent, kisses her companions’ feet, and she seemingly stops eating completely, apparently living only on Holy Communion. All of these facts are cause for some concern, but she does seem very devout and is willing to do even the most menial and unwanted tasks, so her "extravagances" are for the most part downplayed, at least for now...
It is at this time that another prodigious mystical gift of Sr. Magdalena appears: she can seemingly predict the future. In 1515, she announces the death of King Ferdinand for the following year, which comes to pass as foretold, and also the regency of Cardinal Francisco Jiménez de Cisneros over the kingdom of Castile. In sign of gratitude, Cardinal Jiménez has a beautiful vermilion ostensory given to her, which increases the admiration and devotion of her fellow sisters and others even more.
On March 25, 1518, the day of the Feast of the Annunciation, Magdalena discreetly tells her Abbess some news which fills the pious woman with great confusion and perplexity--Magdalena states that on the preceding night, that is, the solemn Vigil of the Annunciation, she had conceived the child Jesus by the power of the Holy Spirit. Thus Magdalene of the Cross, the shining light of the convent of Saint Elizabeth of the Angels, is pregnant....
The nuns are all informed of the situation, and soon the convent is divided into two camps. On the one side, there are those who doubt the miraculous conception, some perhaps because they feel a hidden envy for Magdalena. Others because it is such a extraordinary thing that has never happened outside of the Blessed Virgin Mary, and there is nothing in Sacred Scripture that would point to such a second birth of Jesus into this world...
On the other side, there are those, also numerous, who say that God works in mysterious ways, and that the Most High has been pouring all sorts of extraordinary graces on his humble servant for many years. Understandably they cannot fathom how she could have possibly stained her purity; she who is so seemingly devout and pious, and besides she never leaves the convent grounds. To that, the doubters reply that she receives her confessor alone, and also that the bars on the convent fence are so widely spaced as to allow the passage of a much more cumbersome being than the Holy Spirit...
Seemingly even more devout in the practice of virtue, she redoubles the severity of her penances, walking barefoot on pieces of broken glass and lashing her back and shoulders with instruments of severe mortification, along with wearing a rough cilice discipline...
Hearing the news, the Archbishop of Seville sends three experienced matron "midwives" to examine Magdalena. Having very carefully examined her, they announce that while it is indeed true that the nun is pregnant, it is also very much a fact that her virginity is completely intact and unquestionable. Prayers of thanksgiving explode in all the churches and throughout the land, and inside the convent the doubters and gossipers are reduced to utter silence and penances for their apparent doubts..
On Christmas Eve, 1518, Magdalena confirms that she will very soon give birth. A little house at the end of the garden is prepared for her, for in a vision her guardian angel recommends that she give birth alone, so as to suffer more without any human assistance. Magdalena remains locked up in the little house for three days, during which time the whole community remains in prayer. The story that Magdalena tells when she comes out is absolutely prodigious...
She relates that during Christmas night, at midnight, she gives birth to a magnificent baby who radiates so much light that she can see as if it were high noon. The cold air of her chamber is suddenly miraculously heated and the divine child doesn’t suffer at all from the cold. During this time, strangely Magdalena’s hair begins to grow very fast and, from crow black that it was, it changes to the brightest blond, with its long length allowing her to swaddle the infant child in it, and keep him warm in the softest of tunics. As proof of the miracle, she cuts a few of her blond curls before her hair turns back to normal. The nuns then compete for a few of the miraculous hairs to keep as precious relics. - See more at: http://www.mysticsofthechurch.com/2011/12/sister-magdalena-of-cross-nun-who-made.html#sthash.pOfzMlwQ.dpuf
Continuing with the story of the remarkable birth, Sr. Magdalene de la Cruz states that on the morning after Christmas she found herself alone, the beautiful little child gone, but with her breast chapped from suckling him, along with all of the stigmata of recent delivery still on her body. Soon the matron midwives are sent again to check on the veracity of these facts and to verify that Magdalena’s virginity has not suffered from the event. A solemn 'Te Deum' is then sung in the cathedral and donations flow in like never before...
In spite of this proof, Sr. Magdalena is subjected to another test, this time concerning her abstinence from food; a fast which she allegedly has been carrying out for eleven years. For, it was being insinuated that certain novices were secretly bringing her food.
So the Abbess then requests that a vigilant guard of two monks from the nearby Franciscan monastery be positioned at the entrance to Magdalena's cell with a 24 hour watch; the two monks taking turns with others in a rotating schedule. Additionally, she even orders that the window shutters of the chamber be nailed shut. After a few days, it is discovered that Magdalena has suddenly disappeared. They look for her everywhere, and soon find her in the completely opposite part of the garden, asleep near a fountain. The monks assure the abbess that they have not relaxed their surveillance for an instant. For her part, Sr. Magdalena reveals that it is Saint Francis himself who transported her to this place. Of course nobody is able to give any explanation for this prodigy, and it is concluded that this is but another miracle in the extraordinary life of Sister Magdalena of the Cross.
It is suggested that she should become the Abbess, since as time passes the current Abbess is becoming infirm....
With Magdalena now in charge, in the beginning life in the convent hardly changes, except Mother Magdalena seems to have a strong penchant for the practice of severe penances, and she exhorts her religious sisters to do likewise. In doing so, the new Abbess sometimes provokes very difficult scenes. And so it is that during Confession the sisters, by hypocrisy or fear of too difficult penances, now usually only accuse themselves of small faults. Hearing of this, Mother Magdalena enters into holy wrath which soon causes unspeakable fear into her sisters. She orders them to admit to more severe sins, and the poor nuns become frightened by the severity of the abbess. Some burst into tears, and there are a couple of others who astonishingly go into a sort of semi-possession, rolling on the floor and arching their bodies, before slowly returning back to normal. ..
But from now on, Mother Magdalena orers that the candles are to remain lit, and the nuns are given all the necessary time to openly whip themselves in the performance of bodily mortification and penance, in the full light and prescence of the other nuns. ..
Gone now are the "little penances" consisting of begging food from each table; for according to Mother Magdalena a soul with pride can submit to that easily enough. For acording to her it is severe mortification which is the salt of true penitence. The nuns are now encouraged to remain on their knees on boards garnished with rounded iron nailheads; they are encouraged to wear cilices or belts with small iron spikes pointing inwards and are encouraged to stretched out in doorways so that the others nuns can walk upon them and some wear a crown made of thorns. Yet these extreme severities seemingly do not harm the outward devotion of most of the community to their new Abbess. She is twice re-elected with the majority of the votes...
she is still said to be fasting on a daily basis for over thirty years now. ..
In 1543, she falls gravely ill..As time progrsses, Magdalena's illness continues to get worse. Seemingly out of character, she is now worried, and often asks the doctor to keep her informed on the evolution of her illness. One December day, she hears: “You are dying. You will not see another Christmas.” Greatly anguished, Magdalena suddenly twists on her bed and then rises up and lets out mysterious words:
“1544!...The forty years as announced!; I am a cursed dog! Take me to Hell!” Then she falls back into her bed and begins uttering revolting blasphemies before suddenly being taken from her bed by an inisible force and held in mid-air. She then falls heavily onto the bed several times, but apparently without hurting herself...The demon first lets out a terrible cry in which the name “Balban” is recognised. Later during exorcisms it was discovered that another demon named "Patorrio" was also influencing her. --:
Next, an Inquisitor is sent to investigate the thorny matter by the express order of Cardinal Juan Pardo de Tavera, the Primate of Spain. He is much younger than the Rev. Don Juan of Cordova and he inspires her with confidence. She reveals to him that the beautiful dark-haired young man who appeared to her at the age of five was in fact the devil. He had promised her fame and the respect of everyone, if she would consent to obey him always. http://www.mysticsofthechurch.com/2011/12/sister-magdalena-of-cross-nun-who-made.html#sthash.pOfzMlwQ.dpuf
Then we have Catherine of Siena;
Catherine's desire to suffer was so extreme that nothing could deter her. When her mother took the virgin to the hot springs and Vignoli in order to remove Catherine from her self imposed torture, the Saint flung herself into the part of the canals where the hot sulfuric water flowed into the pool - the burn caused by the boiling waters surpassed the pain of any flagellation.
Catherine's most frequently discussed ascetic practice is her self-starvation, her "holy anexoria." Beginning when she was not yet 16, Catherine restricted her diet to bread, uncooked vegetables and water. The next step toward complete rejection of terrestial sustenance came five years later.
While dressing the cancerous breast sores of a woman she was tending, Catherine felt repulsed at the horrid odor of the suppuration. Determined to overcome all bodily sensations, she carefully gathered the pus into a laddle and drank it all. That night she envisioned Jesus inviting her to drink the blood flowing from his pierced side, and it was with this consolation that your stomach " no longer had need of food and no longer could digest. (Bell 25) ...by the aged of 25 is reported that she absolutely ate nothing.
In January of 1 380, now in Rome, while contemplating Christ' s circumcision and his precious blood there shed, Catherine decided to increase her asceticism and drink no water. She still traveled the mile to St. Peter' s each day to spendgg CARTE ITALIANE hours in prayer. On February 26, the Saint lost the use of her legs, yet one biographer claims that she still managed to arrive at St. Peter' s during Lent. On Aprii 29, 1380, starved, dehydrated, and physically ravaged, Saint Catherine died. - Furth, Megan, Stanford University, Holy Alliance: Saint Catherine of Siena and the Paradox of Flesh; https://escholarship.org/uc/item/2768w4js.pdf
And which fasting is called Anorexia mirabilis, which
Anorexia mirabilis literally means "miraculous lack of appetite". It refers almost exclusively to women and girls of the Middle Ages who would starve themselves, sometimes to the point of death, in the name of God.
Many women notoriously refused all food except for the holy Eucharist, signifying not only their devotion to God and Jesus, but also demonstrating, to them, the separation of body and spirit. That the body could exist for extended periods without nourishment gave people of the time a clear picture of how much stronger, and therefore how much more important, the spirit was. It mattered not in popular opinion that the reported periods of female fasting were impossibly long (from months to many years) and simply added to the allure of this very specifically female achievement. Angela of Foligno
Both Angela of Foligno (1248–1309) and Catherine of Siena (1347–1380) were reportedly anorexia mirabilis sufferers.[6] They both refused food, but drank the pus from the sores of the sick. Angela of Foligno is reported to have said it was as "sweet as the Eucharist", and also to have eaten the scabs and lice from those same patients, though precious little else.[7]
Marie of Oignies (1167–1213) reportedly lived as a hermit, wore only white, cut off pieces of her body to expunge her desire, and both she and Beatrice of Nazareth claimed that not only did the smell of meat make them vomit, but also that the slightest whiff of food would cause their throats to close up entirely.[11][12] -https://en.wikipedia.org/wiki/Anorexia_mirabilis
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; Speaking lies in hypocrisy; having their conscience seared with a hot iron; Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth. (1 Timothy 4:1-3)
wow
What’s even crazier than these Monty Python type stories is that there are Catholics who actually believe them...
Wow...
This obsession with refusing to eat, or denying the body pleasure and embracing “suffering” (of the self) as a means for removing sin seems to be the logical extension of Pelagianism (or, rather, the age old attraction of man towards works-righteousness) that, though it was condemned by the Council of Orange under the influence of Augustine, ended up becoming the dominant view of the Catholic Church despite protestations to the contrary.
It is so ingrained in the Catholic Church’s nature that the idea of self-starvation, of whippings and torturing of oneself, is completely natural and befitting of a Saint. Gone is any sense of Grace, or if they speak of grace, they mean something that has no power within the human being, and which is inevitably the reward for human merit.