Don't judge me

Look well unto thyself, and beware that thou judge not the doings of others. In judging others a man laboureth in vain; he often erreth, and easily falleth into sin; but in judging and examining himself he always laboureth to good purpose. According as a matter toucheth our fancy, so oftentimes do we judge of it; for easily do we fail of true judgment because of our own personal feeling. If God were always the sole object of our desire, we should the less easily be troubled by the erring judgment of our fancy."- the imitation of christ

"Reverence the faculty which produces opinion. On this faculty it entirely depends whether there shall exist in thy ruling part any opinion inconsistent with nature and the constitution of the rational animal. And this faculty promises freedom from hasty judgement, and friendship towards men, and obedience to the gods." -Meditations

By observing what is in another's mind one must of necessity be unhappy.