Gordon B. Hinckley said this quote

You are good. But it is not enough just to be good. You must be good for something. You must contribute good to the world. The world must be a better place for your presence. And the good that is in you must be spread to others… In this world so filled with problems, so constantly threatened by dark and evil challenges, you can and must rise above mediocrity, above indifference. You can become involved and speak with a strong voice for that which is right.