"We can never be sure that the opinion we are endeavouring to stifle is a false opinion; and if we were sure, stifling it would be an evil still."

"To suppose that society can dispense with principles of justice, because it is of opinion that they are not founded on objective truth, is to believe that society is founded on objective truth, which …"

"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 only security against error is in the discussion of every subject, with the greatest freedom of speech."

"The subjection of women is an evil, and a hindrance to human improvement."