Knocking is one of the easiest things in the world to do. It only takes a thimblefull of brains. And it is the cheapest and easiest way to attract attention. But it is a mighty expensive amusement. Everybody hates a knocker.
No man ever got very high by pulling other people down. The intelligent merchant does not knock his competitors. The sensible worker does not knock those who work with him. Don’t knock your friends. Don’t knock your enemies. Don’t knock yourself.
Don’t say cutting things. Speak pleasantly of everybody whether you are pleasantly disposed or not. Boost and you will be boosted. Knock and you will be knocked.
-Dr. Frank Crane