"That the only freedom which deserves the name, is that of pursuing our own good in our own way, so long as we do not attempt to deprive others of theirs, or impede their efforts to obtain it."

"Men are not more zealous for truth than they often are for error, and a sufficient application of legal or even of social penalties will generally succeed in stopping the propagation of either."

"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."

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

"Bad men need nothing more to compass their ends, than that good men should look on and do nothing."