How does biotechnology touch on human destiny? What are its promises and challenges? In search for a response, the present volume turns to the thought of Hans Jonas, one of the pioneers and founding fathers of bioethics. The continued relevance of his ideas is exemplified by the way Jurgen Habermas applies them to the current debate. The chief promise of biotechnology is to increase our freedom by overcoming the limits of the human condition. The main risk of biotechnology, as both Jonas and Habermas see it, is to diminish or outright abolish our capacity for responsibility and morality. It is argued that the greater freedom is not simply freedom from constraints but freedom for our destiny: the freedom to be the benevolent, responsible, and spontaneous authors of our lives, capable of communion and love. The touchstone for evaluating any biotechnological procedure has to be this greater freedom.