For in the absence of debate unrestricted utterance leads to the degradation of opinion. By a kind of Greshams law the more rational is overcome by the less rational, and the opinions that will prevail will be those which are held most ardently by those with the most passionate will. For that reason the freedom to speak can never be maintained merely by objecting to interference with the liberty of the press, of printing, of broadcasting, of the screen. It can be maintained only by promoting debate.

Summary

This quote emphasizes the importance of promoting debate in order to maintain the freedom of speech. It argues that without open and unrestricted discussion, opinions can deteriorate and the rational viewpoints can be overshadowed by less rational ones. The quote suggests that simply opposing interference with freedom of the press or other forms of media is not enough to safeguard free speech. Instead, it emphasizes the need to actively encourage and engage in debates to ensure a diverse range of perspectives and prevent the domination of opinions held by those with the most passion or fervor.