Aristotle

Aristotle, Nicomachean Ethics, 1 1094a24-1095a

to look for precision in a subject only so far as the subject allows

“It is right that we ask [people] to accept each of the things which are said in the same way: for it is the mark of an educated person to search for the same kind of clarity in each topic to the extent that the nature of the matter accepts it.

or allows it

It is the mark of an educated mind to be able to entertain a thought without accepting it.

Anybody can become angry - that is easy, but to be angry with the right person and to the right degree and at the right time and for the right purpose, and in the right way - that is not within everybody's power and is not easy.

Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.

The worst form of inequality is to try to make unequal things equal.