EN
In this paper, I present some directives concerning the ethical use of speech and conversation. I focus on three areas – linguistics, philosophy and religion – and moral rules elaborated there with regard to what should and what should not be revealed by words. From the point of view of linguistics, I analyse modern principles of politeness and maxims of conversation. From the point of view of philosophical reflection, I consider ancient ethics of speech, and in particular: the three sieves of Socrates, rhetoric (lat. ars bene dicendi), and the Aristotelian golden mean. From the point of view of religion, I show the moral rules for words in Buddhism, Judaism, Christianity, Confucianism, and the Toltec faith.