“I became aware, then, of a fundamental fact: To be a revolutionary doctor or to be a revolutionary at all, there must first be a revolution. The isolated effort of one man, regardless of its purity of ideals, is worthless. To be useful it is essential to make a revolution as we have done in Cuba, where the whole population mobilizes and learns how to use arms and fight together. Cubans have learned how much value there is in a weapon and the unity of the people.”