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.
An inner city priest went to the home of a poor old lady in the parish. She was dying. When the priest came to her side, she said, "Don't talk and don't run." She seemed to want to die fully appreciative of her life in God, which was too deep for any consoling words at that point. And she wanted to die appreciative of the human community that incarnates God's presence on this plane of existence, which was too deep for words but not for silent, prayerful human presence. That is contemplative dying.
...We can approach all of the myriad little ego deaths, all the ways we don't get what we want (as opposed to what we need) in our lives, in the same way as that woman faced physical death... We need to leave room for the silence that can free the wonder, as well as for words.