It must always be remembered that what the Constitution forbids is not all searches and seizures, but unreasonable searches and seizures.

The right to defy an unconstitutional statute is basic in our scheme. Even when an ordinance requires a permit to make a speech, to deliver a sermon, to picket, to parade, or to assemble, it need not be honored when it's invalid on its face.

We dedicated ourselves to a powerful idea - organic law rather than naked power. There seems to be universal acceptance of that idea in the nation.

The equal protection standard of the constitution has one clear and central meaning - it absolutely prohibits invidious [repugnant] discrimination by government...Under our Constitution, any official action that treats a person differently on account of his race or ethnic origin is inherently [by nature] suspect and presumptively [probably] invalid...Under the Constitution we have, one practice in which government may never engage in the practice of racism - not even "temporarily" and not even as an "experiment."

We are concerned here only with the imposition of capital punishment for the crime of murder, and when a life has been taken deliberately by the offender, we cannot say that the punishment is invariably disproportionate to the crime. It is an extreme sanction suitable to the most extreme of crimes.

I shall not today attempt further to define the kinds of material but I know it when I see it.

A person's mere propinquity to others independently suspected of criminal activity does not give rise to probable cause to search that person.