When the commission finds that a pig has entered the parlor, the exercise of its regulatory power does not depend on proof the pig is obscene.

Although it may not be a castle, [it is the] functional equivalent of a hotel room, a vacation and retirement home or a hunting and fishing cabin.

Even in high school, a rule that permits only one point of view to be expressed is less likely to produce correct answers than the open discussion of countervailing views.

The level of discourse reaching a mailbox simply cannot be limited to that which would be suitable for a sandbox.

I am aware that many object to the severity of my language; but is there not cause for severity? I will be as harsh as truth, and as uncompromising as justice. On this subject, I do not wish to think, or to speak, or write, with moderation. ... I am in earnest - I will not equivocate - I will not excuse - I will not retreat a single inch - AND I WILL BE HEARD.

Just as the right to speak and the right to refrain from speaking are complementary components of a broader concept of individual freedom, so also the individual's freedom to choose his own creed is the counterpart of his right to refrain from accepting the creed established by the majority.

As a matter of constitutional tradition, in the absence of evidence to the contrary, we presume that governmental regulation of the content of speech is more likely to interfere with the free exchange of ideas than to encourage it. The interest in encouraging freedom of expression in a democratic society outweighs any theoretical but unproven benefit of censorship.