Only just the right quantum of wit should be put into a book; in conversation a little excess is allowable. [ Joubert ]

There are circumstances of peculiar difficulty and danger, where a mediocrity of talent is the most fatal quantum that a man can possibly possess. Had Charles the First and Louis the Sixteenth been more wise or more weak, more firm or more yielding, in either case they had both of them saved their heads. [ Colton ]

The receipt to make a speaker, and an applauded one too, is short and easy. Take commonsense quantum sufficit (in sufficient quantity); add a little application to the rules and orders of the House of Commons, throw obvious thoughts in a new light, and make up the whole with a large quantity of purity, correctness and elegancy of style. Take it for granted that by far the greatest part of mankind neither analyze nor search to the bottom; they are incapable of penetrating deeper than the surface. [ Chesterfield ]