The Second Prophecy Genesis 5
The second Lesson gives us the history of the Deluge. God makes the Waters serve as the minister of his justice, those very Waters which were, afterwards, by Jesus, to become the instrument of his mercy; the Ark, which is a type of the Church, is the shelter for those who would be saved from the flood; the human race is preserved by one family, which represents the Disciples of Christ, who, at first, were few in number, but afterwards peopled the whole earth.
Dom Gueranger Volume VI