What convinces is conviction. Believe in the argument you're advancing. If you don't you're as good as dead. The other person will sense that something isn't there, and no chain of reasoning, no matter how logical or elegant or brilliant, will win your case for you.

There is but one way for a president to deal with Congress, and that is continuously, incessantly, and without interruption. If it is really going to work, the relationship has got to be almost incestuous.

There are no favorites in my office. I treat them all with the same general inconsideration.

Lyndon B. Johnson Quotes