Genesis 6:6 - Joseph Benson’s Commentary on the Old and New Testaments

It repented the Lord, it grieved him at his heart Properly speaking, God cannot repent, Numbers 23:19; 1 Samuel 15:11-29; for he is perfectly wise and unchangeable in his nature and counsels, Malachi 3:6, and James 1:17. Neither is he liable to grief or disappointment, being constantly happy. But this is spoken of God after the manner of men, by the same figure of speech whereby eyes, ears, hands, and feet are ascribed to God, and must be understood so as not to reflect on his immutability or felicity. It doth not imply any passion or uneasiness in God; for nothing can create disturbance to the eternal mind: but it signifies his just and holy displeasure against sin and sinners. Neither doth it speak any change of God's mind, for with him is no variableness; but it signifies a change of his way. When God had made man upright, he rested and was refreshed, Exodus 31:17, and his way toward him was such as showed him to be well pleased with the work of his own hands; but now that man was apostatized, he could not do otherwise than show himself displeased: so that the change was in man, and not in God.