A man will turn over half a library to make one book

Go into the street and give one man a lecture on morality and another a shilling, and see which will respect you most.

He is no wise man that will quit a certainty for an uncertainty

Between falsehood and useless truth there is little difference. As gold which he cannot spend will make no man rich, so knowledge which cannot apply will make no man wise.

Such is the constitution of man that labor may be styled its own reward; nor will any external incitements be requisite, if it be considered how much happiness is gained, and how much misery escaped, by frequent and violent agitation of the body

No man is obliged to do as much as he can do. A man is to have part of his life to himself.