I. God chose to save man by strength made perfect in weakness
The glory, dearly-beloved, of the Lord's Passion, on which we promised to speak again today, is chiefly wonderful for its mystery of humility, which has both ransomed and instructed us all, that He, Who paid the price, might also impart His righteousness to us. For the Omnipotence of the Son of God, whereby He is by the same Essence equal to the Father, might have rescued mankind from the dominion of the devil by the mere exercise of Its will, had it not better suited the Divine working to conquer the opposition of the foe's wickedness by that which had been conquered, and to restore our nature's liberty by that very nature by which bondage had come upon the whole race.
But, when the evangelist says, “The Word became flesh and dwelt in us,” and the Apostle, “God was in Christ reconciling the world to Himself,” it was shown that the Only-begotten of the Most High Father entered on such a union with human humility, that, when He took the substance of our flesh and soul, He remained one and the same Son of God by exalting our properties, not His own: because it was the weakness, not the power that had to be reinforced, so that upon the union of the creature with the Creator there should be nothing wanting of the Divine to the assumed, nor of the human to the Assuming.
Source: Sermons (New Advent)