John Wesley on 1 Samuel 25:31

No grief - The mind and conscience will be free from all the torment which such an action would cause in thee. By which, she intimates, what a blemish this would be to his glory, what a disturbance to his peace, if he proceeded to execute his purpose: and withal implies, how comfortable it would be to him to remember, that he had for conscience to God, restrained his passions. Causeless - Which she signifies would be done if he should go on. For though Nabal had been guilty of abominable rudeness, and ingratitude; yet he had done nothing worthy of death, by the laws of God or of man. And whatsoever he had done, the rest of his family were innocent. Avenged - Which is directly contrary to God's law, Levit 19:18 Deut 32:35. Then - When God shall make thee king, let me find grace in thy sight.