Hebrews 2:7

"What is man that Thou art mindful of him, or the son of man that Thou visitest him? Thou madest him a little lower than the angels: Thou crownedst him with glory and honor." "Thou hast put all things in subjection under his feet." Now although these things were spoken of human nature generally, they would nevertheless apply more properly to Christ according to the flesh. For this, "Thou hast put all things in subjection under his feet," belongs to Him rather than to us. For the Son of God visited us when we were nothing: and after having assumed our nature, and united it to Himself, He became higher than all.

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.