The following is from John Cassian writing in the fourth century.
That the evil of pride is so great that it rightly has even God Himself as its adversary.
How great is the evil of pride, that it rightly has no angel, nor other virtues opposed to it, but God Himself as its adversary! Since it should be noted that it is never said of those who are entangled in other sins that they have God resisting them; I mean it is not said that God is opposed “to the gluttonous, fornicators, passionate, or covetous,” but only “to the proud.” For those sins react only on those who commit them, or seem to be committed against those who share in them, i.e., against other men; but this one has more properly to do with God, land therefore it is especially right that it should have Him opposed to it.
Peace and Joy!