President Monson shared this poem in his October 2015 General Conference talk Be an Example and a Light.
The talk is part of the Youth Sunday School lesson next week.
"May I say to all of you, and particularly to you young people, that as the world moves further and further away from the principles and guidelines given to us by a loving Heavenly Father, we will stand out from the crowd because we are different. We will stand out because we dress modestly. We will be different because we do not use profanity and because we do not partake of substances which are harmful to our bodies. We will be different because we avoid off-color humor and degrading remarks. We will be different as we decide not to fill our minds with media choices that are base and demeaning and that will remove the Spirit from our homes and our lives. We will certainly stand out as we make choices regarding morality—choices which adhere to gospel principles and standards. Those things which make us different from most of the world also provide us with that light and that spirit which will shine in an increasingly dark world.
It is often difficult to be different and to stand alone in a crowd. It is natural to fear what others might think or say. Comforting are the words of the psalm: “The Lord is my light and my salvation; whom shall I fear? the Lord is the strength of my life; of whom shall I be afraid?”7 As we make Christ the center of our lives, our fears will be replaced by the courage of our convictions.
Life is perfect for none of us, and at times the challenges and difficulties we face may become overwhelming, causing our light to dim. However, with help from our Heavenly Father, coupled with support from others, we can regain that light which will illuminate our own path once again and provide the light others may need."
President Monson
(image found via Google image search)