"Ataraxia should act like a slow-release drug, accumulating over days and weeks. Ancient philosophers believed achieving ataraxia created an emotionalhomeostasis, where the effect wouldn’t just be a more stable base-level mood, but one that would hopefully flow out to the people around you. If you are more tranquil, you will be less likely to react or combust. So not only do you not ruin your own day, you avoid ruining other people’s too. In a tranquil state you may even make better decisions."
As an addition to the premise of tranquility and peaceful nature. One who has inner peace as a humanist, secularly. That person is referred to as Ataraxian.