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.
Unless we are rooted in God, and rooted in the only sure way of listening to God -- namely, silence -- then we are doomed to spend our lives standing at the window of life and watching the world go by... It strikes me that most of the first part of our lives is spent filling our heads with information. The last part -- and the most important part -- is spent emptying our heads of all the trivia so that our hearts may be free to learn wisdom -- in silence.