From "How to Win Friends and Influence People" by Dale Carnegie
1. You can’t win an argument: The only way to get the best of an argument is to avoid it.
2. A sure way of making enemies — and how to avoid it: Show respect for the other man’s opinions. Never tell a man he is wrong.
3. If you’re wrong, admit it: If you are wrong, admit it quickly and emphatically.
4. The high road to a man’s reason: Begin in a friendly way.
5. The secret of Socrates: Get the other person saying “yes, yes” immediately.
6. The safety valve in handling complaints: Let the other man do a great deal of the talking.
7. How to get co-operation: Let the other fellow feel the idea is his.
8. A formula that will work wonders for you: Try honestly to see things from the other person’s point of view.
9. What everybody wants: Be sympathetic with the other person’s ideas and desires.
10. An appeal that everybody likes: Appeal to the nobler motives.
11. The movies do it. Radio does it. Why don’t you do it? Dramatize your ideas.
12. When nothing else works, try this: Throw down a challenge.
If you want to defeat your enemy, sing his song.