"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 strongest of all arguments against the present constitution of society is, that it does not permit the free development of every individual."

"The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race."

"The only way in which a human being can make some approach to knowing the whole of a subject, is by hearing what can be said about it by persons of every variety of opinion, and studying all modes in …"

"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."