Even a superstitious man has certain inalienable rights: the right to harbor and indulge his imbecilities, provided only that he does not try to inflict them upon others by force; he has the right to argue for them as eloquently as he can. But he has no right to be protected from the criticism of those who do not hold them. He has no right to demand that they be treated as sacred. He has no right to preach them without challenge.