Why prove to a man he is wrong? Is that going to make him like you? Why not let him save face? He didn't ask for your opinion. He didn't want it. Why argue with him? You can't win an argument, because if you lose, you lose it; and if you win it, you lose it. Why? You will feel fine. But what about him? You have made him feel inferior, you hurt his pride, insult his intelligence, his judgment, and his self-respect, and he'll resent your triumph. That will make him strike back, but it will never make him want to change his mind. A man convinced against his will is of the same opinion still.
Very often in everyday life one sees that by losing one's temper with someone who has already lost his, one does not gain anything but only sets out upon the path of stupidity. He who has enough self-control to stand firm at the moment when the other person is in a temper, wins in the end. It is not he who has spoken a hundred words aloud who has won; it is he who has perhaps spoken only one word.