Augustine

"For to taste the sweetness of the Lord was too great, a thing for you; it was too high and remote, and you were too low and cast down into the depths. It was to bridge this great gulf that the mediator was sent. You, as man, could not reach God; God was made man. You cannot reach God, but you can reach man; and now you can come to God through man. Thus there was made a 'mediator between God and man, the man Christ Jesus' [1 Tim 2:5]. If he were man alone, you would be following what you are, and so you would never arrive. If he were God alone, you would fail to comprehend what you are not, and so you would never arrive. God was made man, so that by following a man, which you can do, you may arrive at God, which you could not do."

--Saint Augustine, On Psalm 135:3