In eight talks from 1959 to 1964, the Argentine-born revolutionary challenges youth of Cuba and the world to study, to work, to become disciplined. To join the front lines of struggles, small and large. To politicize their organizations and themselves. To become a different kind of human being as they strive together with working people of all lands to transform the world. And, along this course, to revel in the spontaneity and joy of being young.