John of the Cross,
The Dark Night Of The Soul
“ In this same way we have to philosophize with respect to this Divine fire of contemplative love, which, before it unites and transforms the soul in itself, first purges it of all its contrary accidents. It drives out its unsightliness, and makes it black and dark, so that it seems worse than before and more unsightly and abominable than it was wont to be. For this Divine purgation is removing all the evil and vicious humours which the soul has never perceived because they have been so deeply rooted and grounded in it; it has never realized, in fact, that it has had so much evil within itself. ”
