This is a modified version of a classic prayer by Francis of Assisi (1181-1226). Francis was a friar who diligently preached, sought, and prayed for peace in his day. He was known for abandoning a life of luxury in order to put others first, and this prayer is evidence of that.

Lord, make me an instrument of your peace.
Where there is hatred, let me sow love. 
Where there is injury, let me sow pardon. 
Where there is doubt, let me sow faith. 
Where there is despair, let me sow hope. 
Where there is darkness, let me sow light. 
Where there is sadness, let me sow joy. 
Lord, make me an instrument of your peace.
Use me despite my weaknesses, 
Use me because of my weaknesses, 
That the strength of your grace might be made known. 
As you use me, change my desires. 
Make me long to console more than be consoled.
Make me want to understand more than be understood.
Make me desire to love more than be loved.
For it is in giving that we truly receive. 
Lord, make me an instrument of your peace.