For a man who walks in the light, to stay humble is not to walk in the dark; you don't need to project yourself to be thought an honest man.

One lie can tarnish a thousand truths.

A liar only uses the truth when they want their lies to sound truthful.

No one believes a liar. Even when she's telling the truth.

A man is never more truthful than when he acknowledges himself as a liar

It seems too simplistic that just repeating a persuasive message should increase its effect, but that’s exactly what psychological research finds (again and again). Repetition is one of the easiest and most widespread methods of persuasion. In fact it’s so obvious that we sometimes forget how powerful it is.