God’s mercy looked at us in our miserable and helpless estate, but how to do it without wronging the justice of God? It is a pity, says Mercy, that such a noble creature as man should be made to be undone; and yet God’s justice must not be a loser. What way then shall be found out? Angels cannot satisfy for the wrong done to God’s justice, nor is it fit that one nature should sin, and another nature suffer. What then? Shall man be for ever lost? Now, while Mercy was thus debating with itself, what to do for the recover of fallen man, the Wisdom of God stepped in; and thus the oracle spake: —Let God become man; let the Second Person in the Trinity be incarnate, and suffer; and so for fitness he shall be man, and for ability he shall be God; thus justice may be satisfied, and man saved. O the depth of the riches of the wisdom of God, thus to make justice and mercy to kiss each other!
(Thomas Watson, Body of Divinity, Baker: 1979 (reprint of 1890 ed.)
Thinking allowed 