God give me the serenity to accept things which cannot be changed;
Give me courage to change things which must be changed;
And the wisdom to distinguish one from the other.
Reinhold Niebuhr
The day is always his, who works in it with serenity and great aims. Ralph Waldo Emerson
Boredom is the feeling that everything is a waste of time; serenity, that nothing is. Thomas Szasz
Waves of a serene life pass over us from time to time, like flakes of sunlight over the fields in cloudy weather.
Henry David Thoreau
A quiet conscience makes one so serene. Lord Byron
Serenity comes not alone by removing the outward causes and occasions of fear, but by the discovery of inward reservoirs to draw upon. Rufus M Jones
Great music is in a sense serene; it is certain of the values it asserts. Rebecca West
I count only the hours that are serene. Maurice Maeterlinck