Parrhesia is a kind of verbal activity where the speaker has a specific relation to truth through frankness, a certain relationship to his own life through danger, a certain relation to himself or other people through criticism … , and a specific relation to moral law through freedom and duty. More precisely, parrhesia is a verbal activity in which a speaker expresses his personal relationship to truth, and risks his life because he recognizes truth-telling as a duty to improve or help other people (as well as himself). In parrhesia, the speaker uses his freedom and chooses frankness instead of persuasion, truth instead of falsehood or silence, the risk of death instead of life and security, criticism instead of flattery, and moral duty instead of self-interest and moral apathy.
PETERS, Michael (2003) p213 Truth-telling as an Educational Practice of the Self: Foucault, Parrhesia and the ethics of subjectivity, Oxford Review of Education, Vol. 29, No. 2,