Regarding a Liar

Here are some quotes my mom sent me from an old book. I'll track down the full citation when I can. In the meantime, for your consideration:

"The punishment of a liar is that he eventually believes his own lies."

"Every life is its own excuse for being, and to deny or refute the untrue things that are said of you is an error of judgment. All wrong recoils upon the doer, and the man who makes wrong statements about others is himself to be pitied, not the man he vilifies. It is better to be lied about than to lie.

"At the last no one can harm us but ourselves."