Augustine of Hippo
Noah serves as a foreshadowing of Christ, and the ark represents the entirety of the earth. The purpose of placing all the animals within the ark was to symbolize the various nations. God did not require the animals to recreate every species, for when they were absent, He commanded the earth to bring forth living creatures, and it obeyed (See Gen. 1:24). Therefore, just as He created them then, He would do so now; as He spoke them into existence, so too would He renew them by His word. By including the animals in the ark, did He not reveal the hidden mystery and fulfill the prophecy, depicting the nations through the wood of the ark, where the essence of all nations was established?
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Were there not other patriarchs? Did not Noah precede these holy figures, being the sole individual along with his family deemed worthy to be rescued from the deluge? In him, as well as in his descendants, the image of the Church was anticipated. They found salvation through the tree that delivered them from the flood.