Here is a song by the holy and saintly Erez Levanon tz"l who was murdered by Islamic terrorists while in the midst of prayer. It is called Or Balev- Light in the Heart. The refrain is: "Don't give up and don't despair. You have greatness in you, you have a fire inside. Do what you can, do it with passion because the Supreme Heart is alight within you."
Yehi Zichro Barukh- May his memory be a blessing!