The Serenity Prayer

God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference. - Reinhold Neibuhr, 1934

The Gestalt Prayer

I am I, and you are you. I do my thing, and you do your thing. 
I am not in this world to live up to your expectations, and you are not  in this world to live up to mine. If by chance we meet, it's beautiful.  If not,
it can't be helped. - Fritz Perls, M.D.

The Key to Mental Health

Settle for disorder in lesser things for the sake of order in
 greater things; and therefore be content to be discontented
in many things. -