If there is any fixed star in our constitutional constellation, it is that no official, high or petty, can prescribe what shall be orthodox in politics, nationalism, religion, or other matters of opinion, or force citizens to confess by word or act.

It is not the function of the government to keep the citizen from falling into error; it is the function of the citizen to keep the government from falling into error.

To believe that patriotism will not flourish if patriotic ceremonies are voluntary... is to make an unflattering estimate of the appeal of our institutions to free minds.