Genesis 6:9 describes Noah as a just man and perfect in his generations, and that he walked with God. The phrase "perfect in his generations" has been misunderstood, but it does not refer to racial purity or genetic perfection. Instead, it pertains to the context of Noah's life and times, emphasizing his spiritual qualities. His fear of God and obedience to His instructions, along with his righteousness, were the reasons God chose Noah to build the ark and reestablish human society. God valued Noah's integrity and morality, not physical traits or social status, as the basis for his salvation and role in His plan.