"The greatest good for the greatest number is the measure of right and wrong."

"The only security against error is in the discussion of every subject, and the careful examination of all arguments, by which it can be supported or opposed."

"No one can be a great thinker who does not recognize, that as a thinker it is his first duty to follow his intellect to whatever conclusions it may lead."

"Eccentricity has always abounded when and where strength of character has abounded; and the amount of eccentricity in a society has generally been proportional to the amount of genius, mental vigour, …"

"The only part of the conduct of any one, for which he is amenable to society, is that which concerns others."