I would humbly suggest reading the comments on Father Z’s site. Context is given along with the fact that St. Catherine called a Pope to task herself.
Canon lawyer, Dr. Edward Peters:
“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.” I’m sorry. I don’t care who said it. I’m fed up with pious nonsense begin passed off as profound verities. Let this quote from one of my all-time most favorite saints (if you have not read Undset’s bio of her, do so today!) remind us all that great holiness is still possible even for folks who, at least once in their glorious lives, said something stupid.