John Wesley on Genesis 6:3

My spirit shall not always strive with man - The spirit then strove by Noah's preaching, 1Pet 3:19, and by inward checks, but 'twas in vain with the most of men; therefore saith God, he shall not always strive, for that he also is flesh - Incurably corrupt and sensual, so that 'tis labour lost to strive with him. He also, that is, all, one as well as another; they are all sunk into the mire of flesh. Yet his days shall be an hundred and twenty years - So long will I defer the judgment they deserve, and give them space to prevent it by their repentance and reformation. Justice said, cut them down; but mercy interceded, Lord, let them alone this year also; and so far mercy prevailed, that a reprieve was obtained for six score years.