In this masterful new study, Besancenot and Löwy explore and situate Guevara’s ethical, revolutionary, and humanist legacy. They explicate Guevara’s emphasis on the importance of the individual coming to understand and accept socialism at a personal level. For Guevara, Besancenot and Löwy show, the revolutionary project demands more than a transformation of the mode of production; it demands a profound transformation of the individual, the birth of what Guevara termed the ‘new man.’ Besancenot and Löwy also explore Guevara’s pragmatic approach to the question of state power and unique theoretical contributions to the question of the transition to socialism. In Guevara, Besancenot and Löwy find a life that was lived as an example of revolutionary potential. Guevara’s ethical and political sensibilities, unwavering anti-imperialism, and firm commitment to revolutionary social transformation still ignite hope in all who struggle for a better world.