The Serenity Prayer is generally know by its first three lines and perhaps not know in its entirety.

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.

Reinhold Niebuhr