Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed. I do not imply that we should always suppress the utterance of intolerant philosophies; as long as we can keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary.