My mom loved the Serenity Prayer written by Reinhold Niebuhr, but she only knew the first four lines.
In the Celebrate Recovery Participants Guide published by Zondervan and copyrighted by John Baker in 1998, 2012 it is written in full.
Prayer for Serenity
God, grant me the serenity
to accept the things I cannot change,
the courage to change the things I can,
and the wisdom to know the difference.
Living one day at a time,
enjoying one moment at a time;
accepting hardship as a pathway to peace;
taking as Jesus did,
this sinful world as it is,
not as I would have it;
trusting that You will make all things right
if I surrender to Your will;
so that I may be reasonably happy in this life
and supremely happy with You forever in the next.
Reinhold Niebuhr wrote this prayer in its earliest form in 1937 according to Wikipedia.