Christ willed freely with His divine and His human will to be obedient to God the Father till death, for free will is absolutely inherent in every rational nature. After all, of what good can rationality be to a nature that does not reason freely?
Now, the Creator has implanted a natural appetite in brute beasts which constrains them to act for the preservation of their own nature. For, since they lack reason, they cannot lead; rather, they are led by their natural appetite.
From this we may see that the human race does not descend from the apes; however it seems that as we move away from God, we are becoming more like them.
Based on St. John of Damascus, father Arsenie Boca
A photo from the Vespers of the Nativity of Mother of God. On the throne, Metropolitan Pavlos of Drama.