In his April 1992 general conference talk, "An Attitude of Gratitude," President Thomas S. Monson, then a member of the First Presidency, recounted the New Testament story of how only one of 10 lepers returned to say thank you after being healed by the Savior. Following the theme of gratitude, President Monson went on to express gratitude for mothers, fathers, teachers, friends, his country and the Lord Jesus Christ.
President Joseph F. Smith
“The spirit of gratitude is always pleasant and satisfying because it carries with it a sense of helpfulness to others; it begets love and friendship, and engenders divine influence. Gratitude is said to be the memory of the heart.”
"We sometimes think that being grateful is what we do after our problems are solved, but how terribly shortsighted that is. How much of life do we miss by waiting to see the rainbow before thanking God that there is rain?
Elder Robert D. Hales
"In some quiet way, the expression and feelings of gratitude have a wonderful cleansing or healing nature. Gratitude brings warmth to the giver and the receiver alike."