4 But those who received peace to proclaim it to the people have made Wisdom herself an object of contemplation, so far as human hearts could lay hold on that which “eye has not seen, nor ear heard, neither has ascended into the heart of man.” If it has not ascended into the heart of man, how has it ascended into the heart of John? Was not John a man? Or perhaps neither into John's heart did it ascend, but John's heart ascended into it? For that which ascends into the heart of man is from beneath, to man; but that to which the heart of man ascends is above, from man.
Even so brethren, can it be said that, if it ascended into the heart of John (if in any way it can be said), it ascended into his heart in so far as he was not man. What means “was not man”? In so far as he had begun to be an angel. For all saints are angels, since they are messengers of God. Therefore to carnal and natural men, who are not able to perceive the things that are of God, what says the apostle? “For whereas ye say, I am of Paul, I of Apollos, are you not men?” What did he wish to make them whom he upbraided because they were men?
Do you wish to know what he wished to make them? Hear in the Psalms: “I have said, you are gods; and all of you are children of the Most High.” To this, then, God calls us, that we be not men. But then will it be for the better that we be not men, if first we recognize the fact that we are men, that is, to the end that we may rise to that height from humility; lest, when we think that we are something when we are nothing, we not only do not receive what we are not, but even lose what we are.
Source: Tractates on the Gospel of John (New Advent)