How to Win People to Your Way of Thinking – Principle 7
Don’t you have much more faith in ideas that you discover for yourself than in ideas that are handed to you on a silver platter? If so, isn’t it bad judgment to try to ram your opinions down the throats of other people? Isn’t it wiser to make suggestions—and let the other person think out the conclusion?
Let the other person feel that the idea is his or hers.
* Source: How to Win Friends & Influence People by Dale Carnegie