Don't say, "You are wrong."

Never begin by announcing, "I am going to prove so-and-so to you." That's bad. That's tantamount (無異於的) to saying, "I'm smarter than you are. I'm going to tell you a thing or two and make you change your mind."

You cannot teach a man anything; you can only help him to find it within himself.

Be wiser than other people if you can; but do not tell them so.

You will never get into trouble by admitting that you may be wrong. That will stop all argument and inspire your opponent to be just as fair and open and broad-minded as you are. It will make him want to admit that he, too, may be wrong.

Few people are logical. Most of us are prejudiced and biased. Most of us are blighted (破壞) with preconceived (預先形成的) notions (觀念), with jealousy, suspicion, fear, envy and pride.

"I am convinced now that nothing good is accomplished and a lot of damage can be done if you tell a person straight out that he or she is wrong. You only succeed in stripping (剝去) that person of self-dignity and making yourself an unwelcome part of any discussion."

Agree with thine (your) adversary (對手) quickly.

Carnegie, D. (1981). How to Win Friends & Influence People (Revised Ed.) New York, NY: Pocket Books.