(I've heard this quote from President Monson a few times, but heard it again while listening to byu-tv. It is found HERE, and a similar quote HERE)
“The sweetest experience I know in life is to feel a prompting and act upon it and later find out that it was the fulfillment of someone’s prayer or someone’s need. And I always want the Lord to know that if He needs an errand run, Tom Monson will run that errand for Him.”
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Image from Ryan's LDS Quotes