6:8 found grace. This is the first mention of “grace” in the Bible: the first mention in the New Testament is Luke 1:30, where Mary “found favour” (same word as “grace”) with God. God’s grace is found, not earned! Note the consistent Biblical order here: Noah first found grace, then he was a justified, righteous man, finally becoming perfect (complete or mature) in his relation to both God and man, and ultimately walking with God in a life of total faith and fellowship.
6:9 generations of Noah. This seems to be Noah’s signature concluding his personal record (Genesis 5:29–6:9a). It is significant that his last word emphasizes only that he was being saved from a sinful world merely by the grace of God.
6:9 perfect in his generations. It is likewise significant that the first sentence of the toledoth of Noah’s sons (note Genesis 10:1) stresses the godliness of their father. Noah is an outstanding example of parental example and guidance. His sons were saved on the ark because of his own righteousness (note Genesis 7:1).