It is certain because it is possible.

The angels as the guardians of men are set over men as instructors and monitors. This shows the relationship that is to exist between them. Man's attitude is to be one of obedience and subjection. He is to follow the lead of the angels, and consequently some reverence is already implied in the very relationship that exists between man and angel.

Let women paint their eyes with tints of chastity, insert into their ears the word of God, tie the yoke of Christ around their necks, and adorn their whole persons with the silk of sanctity and the damask of devotion.

I believe because it is absurd.

Whatever is born is the work of God. So whatever is plastered on, is the devil's work.... How unworthy of the Christian name it is to wear a fictitious face - you on whom simplicity in every form is enjoined! You, to whom lying with the tongue is not lawful, are lying in appearance.

Patience ornaments the woman and proves the man.

But all the other frenzies of passions-impious both toward the bodies and toward the sexes-beyond the laws of nature, we banish not only from the threshold, but from all shelter of the Church, because they are not sins, but monstrosities.