Ready, Steady, Play!

In The Box Painting by Mary Stevenson Cassatt from google

Life is a scriptless stage and a plotless play.
Learn to perform its demands with wits to the end,
Casting a heavy mantle of bleakness away
Or act in a shadow of sorrows at your wits’ end.
Set the stage with Oblivion and Memory:
Invoke Oblivion when times are gloomy,
Cherish Memory when they are flowery.