“Do not judge your fellow man until you have come into his situation.”
2:4
Pirkei Avot
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“You can often judge the character of a person by the way he treats his fellow men.”
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The Way of God's Will Chapter 1-7. Judgement http://www.unification.org/ucbooks/WofGW/wogw1-07.htm Translated 1980.

“Always judge your fellow passengers to be the opposite of what they strive to appear to be.”
Maxims of an Old Stager.
Context: Always judge your fellow passengers to be the opposite of what they strive to appear to be.
For instance, a military man is not quarrelsome, for no man doubts his courage; but a snob is.
A clergyman is not over strait- laced, for his piety is not questioned; but a cheat is.
A lawyer is not apt to be argumentative; but an actor is.
A woman that is all smiles and graces is a vixen at heart : snakes fascinate.
A stranger that is obsequious and over-civil without apparent cause is treacherous: cats that purr are apt to bite and scratch.
Pride is one thing, assumption is another; the latter must always get the cold shoulder, for whoever shews it is no gentleman: men never affect to be what they are, but what they are not. The only man who really is what he appears to be is — a gentleman.