"No danger flowing from speech can be deemed clear and present unless the incidence of the evil apprehended is so imminent that it may befall before there is an opportunity for full discussion. Only an emergency can justify repression."

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What finally emerges from the 'clear and present danger' cases is a working principle that the substantive evil must be extremely serious and the degree of imminence extremely high before utterances can be punished...It must be taken as a command of the broadest scope that explicit language, read in the context of a liberty-loving society, will allow.

— Hugo Black