The Title Christ Loved
The reader should take note that the disciples did not once call him by that title Son of Man. It was particularly Christ who used it. … Christ’s use of the title Son of Man is an elevation of his humanity and at the same time a declaration of his divinity. The Son of God in his eternal form came down from heaven as the Son of Man to to gather the chosen humanity together in his person and to ascend with it to heaven so that it would receive its inheritance as part of his inheritance as Son of God, and stand sanctified and blameless in him before God to praise him forever.
We, the redeemed believers, find ourselves invited with Christ in this title in all its aspects and in the essence of his relationship with God the Father. The Son of Man is Christ, the Son of God, who carries humanity in himself. The title Son of Man is given to express the profound union that has bound Christ to his redeemed people. Who is the Son of Man? Is he not the one who took our body and gave us his body so that he is now in us and we in him? And he remains in the Father and we in him.
Matthew the Poor, from The Titles of Christ