John Stuart Mill — "The only security against error is in the discussion of every subject, with the …"

"Capacity for the nobler feelings is in most natures a very tender plant, easily killed, not only by hostile influences, but by mere want of sustenance."

"The grand, leading principle, towards which every argument unfolded in these pages directly converges, is the absolute and essential importance of human development in its richest diversity."

"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 ultimate sanction, therefore, of all morality, is a subjective feeling in our own minds."

"The greatest happiness principle holds that actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness."