Here is the prayer, written by Mother Teresa, that every Missionary of Charity 
says before leaving for his or her duties. 
It is also used as the Physician’s Prayer in Shishu Bhavan,
the children’s home that Mother Teresa oversaw in Calcutta. 
It is recommended that you say it twice a day.

Dear Lord, the Great Healer, I kneel before you
Since every perfect gift must come from you,
I pray, give skill to my hands, clear vision to my mind,
Kindness and meekness to my heart.
Give me singleness of purpose, strength to lift up a part
of the burden of my suffering fellow man,
and a true realization of the privilege that is mine.
Take from my heart all guile and worldliness,
that with a simple faith of child, I may rely on you.”

– From “A Simple Heart,” by Mother Teresa, Ballantine Books, 1995