Success is steady progress toward one's personal goals.
What is easy to do is also easy not to do.
Profits are better than wages. Wages make you a living; profits make you a fortune.
The greatest source of unhappiness comes from inside.
The real problem is usually two or three questions deep. If you want to go after someone's problem, be aware that most people aren't going to reveal what the real problem is after the first question.
Always be willing to look at both sides of the argument. Understanding the other side is the best way to strengthen your own.