One of the oft quoted parts....

.....of the Bible is the piece that contains some strong remarks about the wisdom (or otherwise) of judging people. But it's not just biblical writings that deal with this.  Many ancient texts express a similar note of caution against this very natural, very human tendency. Of course we all pass judgement on one another. Worse still, we do it in an instant, in a heartbeat, in the blink of an eye.

What can possibly give us that right? How can such snap conclusions possibly be right? Do as the good book says -  'Judge not, lest ye be judged.'

We judge ourselves by what we feel capable of doing, while others judge us by 

what we have already done.    (Longfellow)