These are a sampling of the more than 300 inspirational quotations in the book Learning to CARE: Education, Volunteering, and Community Service, by Dr. Patricia Mihaly Nabti:

There is no greater commitment than when people give of themselves. Volunteer activity is the ultimate demonstration of caring. John W. Amerman
Volunteering is your way to help others while bringing meaning to your life. Douglas M. Lawson
Our answer is the world's hope: it is to rely on youth...This world demands the qualities of youth; not a time of life, but a state of mind, a temper of will, a quality of imagination, a predominance of courage over timidity, or the appetite for adventure over the love of ease. Robert F. Kennedy
A candle loses nothing of its light when lighting another. 
Gibran Khalil Gibran
The ultimate measure of a man is not where he stands in the moments of comfort and convenience, but where he stands in times of challenge and controversy. Dr. Martin Luther King, Jr.
Live your life so that your children can tell their children that you not only stood for something wonderful-- you acted on it. Dan Zadra
The only thing necessary for evil to triumph is for good men to do nothing. Edmund Burke
The time is always ripe to do what is right. Dr. Martin Luther King, Jr.
The only struggle that is lost is the one that is abandoned. NEVER GIVE UP. Mothers of the Plaza de Mayo
The starting point for a better world is the belief that it is possible. Norman Cousins
Without a sense of caring, there can be no sense of community. Anthony J. D'Angelo
Our character, basically, is a composite of our habits. Because they are consistent, often unconscious patterns, they constantly, daily, express our character and produce our effectiveness or ineffectiveness. Unknown
Heroes are the people who do what needs to be done, when it needs to be done, regardless of the consequences. Unknown
win/win is a belief in the third alternative. It’s not your way or my way; it’s a better way, a higher way. Covey?
Those who bring sunshine into the lives of others cannot keep it from themselves. James Matthew Barrie 
Do what you can, with what you have wherever you are. Theodore Roosevelt
If we all did the things we are capable of doing we would literally astound ourselves. Thomas Alva Edison
Giving is the secret of a healthy life. Not necessarily money, but whatever a person has of encouragement, sympathy and understanding.  John D. Rockefeller, Jr.