Dishonesty is a vice

Stay away from those who indulge in tarradiddles, petty falsehoods, fibs, rubbish, pretentious nonsense, poppycock, or self-aggrandizing whoppers. They trade in deceit, mendacity, fabrication, manipulation -- the tools of dishonesty.

Their survival rests on making you blind, and keeping you that way. Truth is a fundamental threat to their self-esteem, because it undermines the very structure of their mind and life.