"The human mind, when it is in a healthy state, is never satisfied with having attained a certain measure of truth; it is always aspiring to a higher."

"The 'self-regarding' actions are those which primarily and directly affect only the agent himself."

"The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than tho…"

"The worth of a State, in the long run, is the worth of the individuals composing it."

"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."