A homage to Michelangelo's "Creation of Adam", in which Christ, the second Adam, emptied himself of His divine stature, and took the form of a lowly servant, enduring the shame of the cross (Philippians 2:6-8), so that He may redeem His bride, the church.
Further references: Ezekiel 16:8, Isaiah 6:10, 1 John 4:10