"The merit of Marx is that he suddenly produces a qualitative change in the history of social thought. He interprets history, understands its dynamic, predicts the future, but in addition to predicting it , he expresses a revolutionary concept: the world must not only be interpreted, it must be transformed. Man ceases to be the slave and tool of his environment and converts himself into the architect of his own destiny."

“Let us not attempt, from the pontifical throne of realism-at-any-cost, to condemn all the art forms which have evolved since the first half of the nineteenth century for we would then fall into the Proudhonian mistake of returning to the past, of putting a straitjacket on the artistic expression of the man who is being born and is in the process of making himself.”

“After graduation, due to special circumstances and perhaps also to my character, I began to travel throughout America, and I became acquainted with all of it. Except for Haiti and Santo Domingo, I have visited, to some extent, all the other Latin American countries. Because of the circumstances in which I traveled, first as a student and later as a doctor, I came into close contact with poverty, hunger and disease; with the inability to treat a child because of lack of money; with the stupefaction provoked by the continual hunger and punishment, to the point that a father can accept the loss of a son as an unimportant accident, as occurs often in the downtrodden classes of our American homeland. And I began to realize at that time that there were things that were almost as important to me as becoming famous for making a significant contribution to medical science: I wanted to help those people.”

“The great multitudes continue to develop; the new ideas continue to attain their proper force within society; the material possibilities for the full development of all members of society make the task much more fruitful. The present is a time for struggle; the future is ours.”

“We know that sacrifices lie before us and that we must pay a price for the heroic act of being a vanguard nation. We leaders know that we must pay a price for the right to say that we are at the head of a people, which is at the head of the Americas. Each and every one of us must pay his exact quota of sacrifice, conscious that he will get his reward in the satisfaction of fulfilling a duty, conscious that he will advance with all toward the image of the new man dimly visible on the horizon.”

“If, on the other hand, the groups of underdeveloped countries, lured by the siren song of the vested interests of the developed powers which exploit their backwardness, contend futilely among themselves for the crumbs from the tables of the world's mighty, and break the ranks of numerically superior forces ... our efforts will have been to no avail.”

“What is our ideology? If l were asked whether our revolution is Communist, I would define it as Marxist. Our revolution has discovered by its methods the paths that Marx pointed out.”