Sister Mary Clare felt like snapping at her "Can't you see I'm praying."
But she didn't. She got up and helped the sister carry what she needed.
On the way back to chapel, Sister Mary Clare heard God say, "I answered your prayer."
Sister almost fell over. "What?"
Then she remembered the prayer asks God to use her hands, eyes, ears, feet, etc.
The very next day, the exact same thing happened. But Sister Mary Clare had a different attitude when she got up to help sister.
Here's the prayer:
I want to be completely transformed into Your mercy and to be Your living reflection, O Lord. May the greatest of all divine attributes, that of Your unfathomable mercy, pass through my heart and soul to my neighbor.
Help me, O Lord, that my eyes may be merciful, so that I may never suspect or judge from appearances, but look for what is beautiful in my neighbors' souls and come to their rescue.
Help me, that my ears may be merciful, so that I may give heed to my neighbors' needs and not be indifferent to their pains and moaning.
Help me, O Lord, that my tongue may be merciful, so that I should never speak negatively of my neighbor, but have a word of comfort and forgiveness for all.
Help me, O Lord, that my hands may be merciful and filled with good deeds, so that I may do only good to my neighbors and take upon myself the more difficult and toilsome tasks.
Help me, that my feet may be merciful, so that I may hurry to assist my neighbor, overcoming my own fatigue and weariness. My true rest is in the service of my neighbor.
Help me, O Lord, that my heart may be merciful so that I myself may feel all the sufferings of my neighbor. I will refuse my heart to no one. I will be sincere even with those who, I know, will abuse my kindness. And I will lock myself up in the most merciful Heart of Jesus. I will bear my own suffering in silence. May Your mercy, O Lord, rest upon me (...).
O my Jesus, transform me into Yourself , for you can do all things. 
