Good question.
If a person has true humility, he will not be deceived.
In the classic book for our times, “True Devotion to Mary”, St. Louis de Montfort explains this very well, in the two groups, with Mary or with Satan.
This is also even more explained in:
A VERY GOOD HELP IN THIS PERIOD of the “great tribulation” (Mt 24:21) when the Body of Christ, the Church, and will be crucified (CCC 675-677), and of the great APOSTASY before the manifestation of the Antichrist (2Thess 2:3), is: “To the Priests, Our Lady’s Beloved Sons” (http://our-lady-priests.blogspot.it/).
Almost twenty Cardinals and more than 150 Bishops, more than 50,000 priests and religious, have followed the Marian Movement of Priests (MMP), receiving by way of the book which contains the messages, precious teaching from the Mother of God, in this devastating attack of the ecclesiastical Masonry on the sound doctrine of the Church and the Sacraments, especially the Most Holy Eucharist.
Many bishops have given their Imprimatur to this book. You will find in these messages of Our Lady revealed through Don Stefano Gobbi a resemblance to the writings of Saint Louis de Montfort, Saint Therese of the Child Jesus and to the messages of Our Lady of Fatima, with the sweetness that only the Mother of God, and the Mother of each of us, could communicate to those open to the caresses of Our Lady!
NOTE: They tell me that this web site works only with a ‘PC’ Desktop, but not with a MOBILE CELL PHONE (which I do not have since I am blocked to even load an application!). Many of my web sites are blocked by those who control the world today! Thus you might try Google to find each year of this Blue Book (as well as OTHER ARTICLES OBSCURED by NW0 hackers), with key words such as: Gobbi, beloved, priests, 1973, etc. You might try entering in one or the other of my index web sites:
https://josephdwight.wordpress.com/2015/09/21/joseph-dwight-index/
Here are four of the 27 web sites comprising the whole Blue Book of 25 years of messages of Our Lady:
https://our-lady-priests.blogspot.com/2015/10/our-lady-priests-prologue.html
https://our-lady-priests.blogspot.com/2015/10/our-lady-priests-1973.html
(…)
https://our-lady-priests.blogspot.com/2015/10/our-lady-priests-1997.html
https://our-lady-priests.blogspot.com/2015/10/our-lady-priests-appendix.html
I would highly recommend that you read slowly one meditation from this Blue Book each day so as to let Our Heavenly Mother form and prepare you for this period of the purification of the Church and of the World.
If you might be interested in how I have defended myself in the last 8 years against the continual attacks of the NW0 hackers, go to the end of one of my two index web sites to read how I have managed so far to continue to publish my articles to help people to remain faithful to the Truth of God in this period of great confusion.