"The sole end for which mankind are warranted, individually or collectively, in interfering with the liberty of action of any of their number, is self-protection."

"In the case of any person whose conduct affects prejudicially the interests of others, there is no room for the argument that he should be allowed to do as he likes, because it is his own affair."

"Despotism is a legitimate mode of government in dealing with barbarians, provided the end be their improvement, and the means justified by actually effecting that end."

"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; posterity as well as the existing generation; those who dissent from the opinion, still more than tho…"