Measure another's corn by one's own bushel.
To use a bad man's heart to measure a gentleman's stomach.
you can't compare a gentleman's way of thinking with that of a despicable person
A person who is suspicious of someone else-that's a more accurate explanation
Don't gauge the heart of a gentleman with your own mean measure.-I think it is the best answer.
Gauge the heart of a gentleman with one's own mean measure.