8 So then ought the Christian to be, that he glory not over other “men.” For God has given it you to be over the beasts, i.e. to be better than the beasts. This have you by nature; you shall always be better than a beast. If you wish to be better than another man, you will begrudge him when you shall see him to be your equal. You ought to wish all men to be your equals; and if by wisdom you surpass any, you ought to wish that he also may be wise. As long as he is slow, he learns from you; as long as he is untaught, he has need of you; and you are seen to be the teacher, he the learner; therefore you seem to be the superior, because you are the teacher; he the inferior, because the learner.
Except you wish him your equal, you wish to have him always a learner. But if you wish to have him always a learner, you will be an envious teacher. If an envious teacher, how will you be a teacher? I pray you, do not teach him your enviousness. Hear the apostle speaking of the bowels of charity: “I would that all were even as I.” In what sense did he wish all to be his equals? In this was he superior to all, that by charity he wished all to be his equals. I say then, man has past bounds; he would needs be greedy of more than his due, would be above men, he that was made above the beasts: and this is pride.
Source: Homilies on the First Epistle of John (New Advent)