In being true to the small voice within, you are being of service to others and to the world in the most profound way possible. You cannot know where that voice will take you, but in being willing "to save the only life you could save," you are affirming one of the deepest and most sobering truths of all: no one else can ever walk your journey for you. You alone can respond to your call.
The hardest spiritual work in the world is to love the neighbor as the self - to encounter another human being not as someone you can use, change, fix, help, save, enroll, convince or control, but simply as someone who can spring you from the prison of yourself, if you will allow it.