1 Satan had corrupted man to the uttermost, and God had determined to destroy the man whom He had created for His purpose. Thus, it appeared that God was defeated. But Noah points to the sovereign factor that provided God a way to continue to carry out His original purpose with man. Through Noah’s life and work God gained the victory over His enemy and changed the age.

2 Or, grace. Noah was able to walk with God (v. 9) in that crooked, perverted, and adulterous generation because he found grace (cf. Heb. 4:16). Grace is God coming to us to be our life supply, our strength, and our everything (see note 101 in 1 Cor. 15). Such grace enabled Noah to overcome the flesh and to live a righteous life.
(RV Holy Bible w/footnotes)