Augustine of Hippo

The fact that he is the Word is not the reason why he is a mediator, for certainly the Word at the summit of immortality and the apex of beatitude is far removed from miserable mortals. Rather, he is a mediator because he is human and, as a human, shows us that to attain that supreme good, blessed and beatific, we need not seek other mediators to serve like rungs on a ladder of ascent. For the blessed God who makes us blessed by deigning to share our humanity showed us the shortest way to sharing in his divinity. Freeing us from mortality and misery, he leads us, not to the immortal blessed angels so as to become immortal and blessed by sharing in their nature, but to that Trinity in communion with which even the angels are blessed. When, then, in order to be mediator, he willed to take "the form of a servant" below the angels, he remained in the form of God above the angels, being simultaneously the way of life on earth and life itself in heaven.