Following is a prayer which has influenced my personality and faith experience. This prayer is known as Serenity Prayer and is used by the Alcoholic Anonymous - an organization that helps the alcohol addicts to overcome their addiction. Practicing this prayer (though not an addict!) can transform you to a totally different person in your attitudes and actions.
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.