Freedom is the guiding principle of Jonas’s work, both chronologically and logically, from his early writings on freedom in Paul and Augustine to his later works that place freedom at the heart of cosmological, biological, and anthropological evolution. Thus, freedom is understood in several senses: (1) human freedom as will; (2) physical freedom as the ability to dispose of one’s own body; (3) ontological freedom as the principle of life; (4) cosmological freedom as a tendency within nature; (5) eidetic freedom as representation; (6) ethical freedom as responsibility; and (7) political freedom as the capacity for collective action. Jonas does not content himself with affirming these seven different meanings; he has to thwart the traps and theories that tend to deny them.