Freedom of expression

Freedom of expression is the matrix, the indispensable condition, of nearly every other form of freedom.

Source: wiktionary

This freedom of communication is indispensable for the development and extension of scientific knowledge, a consideration of much practical import. In the first instance it must be guaranteed by law. But laws alone cannot secure freedom of expression; in order that every man may present his views without penalty there must be a spirit of tolerance in the entire population. Such an ideal of external liberty can never be fully attained but must be sought unremittingly if scientific thought, and philosophical and creative thinking in general, are to be advanced as far as possible.

Source: wiktionary

Any test that turns on what is offensive to the community's standards is too loose, too capricious, too destructive of freedom of expression to be squared with the First Amendment. Under that test, juries can censor, suppress, and punish what they don’t like, provided the matter relates to "sexual impurity" or has a tendency "to excite lustful thoughts". This is community censorship in one of its worst forms. It creates a regime where in the battle between the literati and the Philistines, the Philistines are certain to win.

Source: wiktionary

Freedom of expression would not truly exist if the right could be exercised only in an area that a benevolent government has provided as a safe haven for crackpots. The Constitution says that Congress (and the States) may not abridge the right to free speech. This provision means what it says.

Source: wiktionary