“Honesty is the cornerstone of character. The honest man or woman seeks not merely to avoid criminal or illegal acts, but to be scrupulously fair, upright, fearless in both action and expression. Honesty pays dividends both in dollars and in peace of mind.”
This statement is saying that honesty is the foundation of your life. And if you avoid doing the wrong things, that will lead you to be dishonest. Being honesty pays off at the end of the day because it gives you a clear conscience and peace at mind.