"Men are not more zealous for truth than they often are for error, and a sufficiently frequent repetition of error, if not contradicted, passes for truth."

"The only security against total error is discussion."

"Every man who says frankly and without cant, what he thinks, will be in some way a benefactor to his age."

"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."

"He who knows only his own side of the case knows little of that."