Most people deserve each other. Never appeal to his better nature. He may not have one. Never argue with a fool - people might not know the difference. No one test the depth of a river with both feet.
Nothing is as inevitable as a mistake whose time has come.
Old age isn't so bad when you consider the alternative. Open your ears before your mouth. Patience and time do more than strength or passion. People who talk about their inferiors don't have any. Professionals built the Titanic.