Hejinian 23: "Kairos is one of the four principles determining rhetorical power, the other three being logos (the validity of the argument and/or ideas presented), ethos (the credibility of the speaker), and pathos (the power of the utterance to stir the emotions of those who hear it). Kairos identifies a moment as the right one, the propitious one, for the utterance. Its prsence contributes to the utterance's relevance and suitability, increasing its significance and its effectiveness. By extension, this notion of propitious time--and timing--distinguishes kairos, as an experientially important time and therefore as time delineated by an event, from chronos, which clicks along through events and eventlessness alike."