Last week John Ortberg quoted a prayer in his sermon on Serenity. You may not have been familiar with it or taken it all in, so here it is if you wish to use it for yourself.
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.
Living one day at a time;
enjoying one moment at a time;
accepting hardships as the pathway to peace;
taking, as He did, this sinful world
as it is, not as I would have it;
trusting that He will make all things right
if I surrender to His Will;
that I may be reasonably happy in this life
and supremely happy with Him
forever in the next.