I love the Prophet Gordon B. Hinckley. And the recounting of this touching story from his father's memory keeps that love alive.
In the hectic Early mornings, battling to get ready for school, my mother often would extend me the challenge to give some act of kindness during that day to a fellow pupil(or teacher it didn't really matter). The best types of service being the unknown kinds, where the giver is unknown by the receiver. During these my teenage years she tried, and i hope not in vain, to instill a beautiful value in me and the rest of my siblings. A value that would bring true happiness to her children and those they would come in contact with. Teaching us to feel real happiness by being a tool in God's hands to brighten one of His children's day.
Some scriptures that come to mind-
"And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me." Matthew 25:40
"Master, which is the great commandment in the law? Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself." Matthew 22:36-39
"...how many of them are brought to behold the marvelous light of God! And this is the blessing which hath been bestowed upon us, that we have been made instruments in the hands of God to bring about this great work." Alma 26:3