Christ and the Pharisees by Alexander Bida, 1864.jpg
(Luke 2:52): And Jesus advanced in wisdom, and age, and grace with God and men.
For Jesus never had to take on human flesh. For He is truly the Son of God, the Second Person of the Blessed Trinity - God Himself. Yet, as Scripture states, "Jesus did not deem equality with God something to be grasped at. Rather, he emptied himself and took the form of a slave..."
Meditate on Philippians 2:6-7, especially on the word "slave". Since Jesus is God, His very Incarnation was a Sacrifice. The cold, pain, and hunger He endured were all part of His Sacrificial mission, which culminated on the Cross. The baby in the manger, as He stretched out his little arms, knew that those same arms would one day be drawn out and pierced. Likewise, the spiritual talk today centered on such themes of Jesus's sacrifice being alluded to in Scripture.