We cannot altogether deny that treason may be committed as much by words as by deeds.
Gist of Idea
Treason may be committed as much by words as by deeds
Baruch de Spinoza (Tractatus Theologico-Politicus , 20.05)
For example, betraying a major state secret. This is an important idea, for anyone who simplistically demands utter freedom of speech. There is also subversive speech, which is very hard to assess. Incitements can be crimes in Britain.
Spinoza,Benedict de: 'Theological-Political Treatise', ed/tr. Israel,Jonathan [CUP 2007], p.252