It’s an inspiring song. It’s a song which tells a person that he/she won’t forever be here with his/her little light. It tells a person to let his/her light shine, to allow others benefit from his/her gift. The light, no matter how little, triumphs over darkness. Even a twinkle is useful as a guide when allowed to shine.
So many people go through life holding on to their little lights, guarding it jealously as if allowing it to shine will hurt them.