I never knew what serenity was, much less that I was missing it, until I began to rely upon God. That happened right around the time I turned 30. Now I crave serenity and when the chaos of life steals it away, I seek God to restore me to peace. It usually involves a change in perspective. My serenity is inversely proportional to my expectations of others and the world.
When I let people be who they are, while taking care of myself as God would have me do, refraining to take the actions of others so personally, my soul finds rest.