St Gregory Nazianzen in his poem Against Apollinaris, 50 sq., asks how two things so far apart as Deity and humanity could be united, and replies:

  'Tis mystery, I but conjecture make.
  Divinity with flesh unmeet to blend:
  But thinking Soul, as 'twere a frontier power,
  Image of God, in body domiciled,
  Is apt to mediate between the twain.
  The Godhead then conjoined itself with Soul,
  And so assumed dimensions of a man.

Of God and His Creatures: 4.44