Serenity Prayer

"God grant us the serenity to accept the things we cannot change, courage to change the things we can, and wisdom to know the difference."

I am not a Christian but I have came across this prayer a few times. I believe everyone must have these 3 virtues : Serenity, Courage and Wisdom to face life problems and difficulties though not all necessary require granting from God.

I personally felt it's a very meaningful prayer.