I think one person can hardly understand why another has conducted his life in such a way, how he came to commit certain actions and not others, whether he looks upon the past with mostly pleasure or equanimity or regret. Equanimity suggests especially a characteristic or habitual steadiness of mind or evenness of temper. Composure usually suggests calmness that is achieved or maintained by an effort of will, especially under trying circumstances.
Serenity is calmness that suggests immunity to agitation or turmoil.
All rights reserved.