“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.”

Reinhold Niebuhr

Karl Paul Reinhold Niebuhr (June 21, 1892 – June 1, 1971) was an American theologian. A Protestant, he is best known for his study of the task of relating the Christian faith to the realities of modern politics and diplomacy.(source:wikipedia.org)

James 1: 4-6

4 Let perseverance finish its work so that you may be mature and complete, not lacking anything.
5 If any of you lacks wisdom, you should ask God, who gives generously to all without finding fault, and it will be given to you.
6 But when you ask, you must believe and not doubt, because the one who doubts is like a wave of the sea, blown and tossed by the wind.