Did Marc Aurele write Give me the serenity to accept the things I cannot change the courage to change the things I can change and the wisdom to know the difference?
This is the Serenity Prayer and attribution of it is in dispute. It has existed since at least the mid-1930's and perhaps as long ago as the 19th century.
Reinhold Niebuhr
Addendum: Niebuhr's, The Serenity Prayer (1934) reads:
"God, give us grace to accept with serenity the things that cannot be changed, Courage to change the things which should be...
Serenity Prayer God grant me the SERENITYto accept the things I cannot change; COURAGE to change the things I can; and WISDOM to know the difference.Living one day at a time; enjoying one moment at a...