At the heart of the First Amendment is the recognition of the fundamental importance of the free flow of ideas and opinions on matters of public interest and concern. The freedom to speak one's mind is not only an aspect of individual liberty – and thus a good unto itself – but also is essential to the common quest for truth and the vitality of society as a whole. We have therefore been particularly vigilant to ensure that individual expressions of ideas remain free from governmentally imposed sanctions. The First Amendment recognizes no such thing as a "false" idea.

Speech is an essential mechanism of democracy, for it is the means to hold officials accountable to the people. [...] The right of citizens to inquire, to hear, to speak, and to use information to reach consensus is a precondition to enlightened self-government and a necessary means to protect it. [...] By taking the right to speak from some and giving it to others, the Government deprives the disadvantaged person or class of the right to use speech to strive to establish worth, standing, and respect for the speaker’s voice. The Government may not by these means deprive the public of the right and privilege to determine for itself what speech and speakers are worthy of consideration. The First Amendment protects speech and speaker, and the ideas that flow from each.

Somewhere along the line we started misinterpreting the First Amendment and this idea of the freedom of speech the amendment grants us. We are free to speak as we choose without fear of prosecution or persecution, but we are not free to speak as we choose without consequence.

Our First Amendment freedoms give us the right to think what we like and say what we please. And if we the people are to govern ourselves, we must have these rights even if they are misused by a minority.

The First Amendment was designed so as to permit a flowering of man and his idiosyncracies, but we have greatly diluted it. Although the Amendment says that Congress shall make ‘no law’ abridging freedom of speech and press, this has been construed to mean that Congress may make ‘some laws’ that abridge that freedom.

An unconditional right to say what one pleases about public affairs is what I consider to be the minimum guarantee of the First Amendment.

It seems self-evident that all speech criticizing government rulers and challenging current beliefs may be dangerous to the status quo. With full knowledge of this danger, the Framers rested our First Amendment on the premise that the slightest suppression of thought, speech, press, or public assembly is still more dangerous. This means that individuals are guaranteed an undiluted and unequivocal right to express themselves on questions of current public interest. It means that Americans discuss such questions as of right and not on sufferance of legislatures, courts or any other governmental agencies. It means that courts are without power to appraise and penalize utterances upon their notion that these utterances are dangerous. In my view, this uncompromising interpretation of the Bill of Rights is the one that must prevail if its freedoms are to be saved. Tyrannical totalitarian governments cannot safely allow their people to speak with complete freedom. I believe with the Framers that our free Government can.

The First Amendment prohibits the establishment of religion and promises the free exercise of religion. From these safeguards, and from the guarantee of freedom of speech, it follows there is freedom of belief and expression. It is an urgent necessity that officials adhere to these constitutional guarantees and mandates in all their actions, even in the sphere of foreign affairs. An anxious world must know that our Government remains committed always to the liberties the Constitution seeks to preserve and protect, so that freedom extends outward, and lasts.

The First Amendment's language leaves no room for inference that abridgments of speech and press can be made just because they are slight. That Amendment provides, in simple words, that "Congress shall make no law . . . abridging the freedom of speech, or of the press." I read "no law . . . abridging" to mean no law abridging.

The very purpose of the First Amendment is to foreclose public authority from assuming a guardianship of the public mind through regulating the press, speech and religion. In this field, every person must be his own watchman for truth, because the forefathers did not trust any government to separate the true from the false for us.

A fundamental principle of the First Amendment is that all persons have access to places where they can speak and listen, and then, after reflection, speak and listen once more. The Court has sought to protect the right to speak in this spatial context. A basic rule, for example, is that a street or a park is a quintessential forum for the exercise of First Amendment rights. See Ward v. Rock Against Racism, 491 U. S. 781, 796 (1989). Even in the modern era, these places are still essential venues for public gatherings to celebrate some views, to protest others, or simply to learn and inquire.

The First Amendment isn't about free thought and free opinion and free belief. The First Amendment is about free exercise--the carrying into practice of religious principles, and beliefs, and convictions.

First Amendment freedoms are most in danger when the government seeks to control thought or to justify its laws for that impermissible end. The right to think is the beginning of freedom, and speech must be protected from the government because speech is the beginning of thought.

The First Amendment does not insulate you from criticism. In fact, that's the First Amendment in action. That is how the marketplace of ideas works. We float our ideas in the marketplace, and we see which idea sells.