tranquility is defined as the life condition of serenity
Page 171 tranquility is defined as the life condition of serenity. the life condition of tranquility represents a fundamentally neutral state In which our core affect lies exactly midway between the extremes of joy and suffering.
— from The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy) · 10 worlds new psychology of happiness