Mary's Pregnancy: When Mary was impregnated, was Jesus then partly human and part God, or all God? [Luke 1:35]. "Built Upon This Rock" (Peter): What is meant by the church being built on this rock? Is he referring to the revelation (confession) of the Apostle Peter? [Matthew 16:18, Ephesians 2:20, Revelation 21:14, 1 Peter 2:5].