And questions give us no rest. We know not why our curse makes us seek we know not what, ever and ever. But we cannot resist it. It whispers to us that there are great things on this earth of ours, and that we can know them if we try, and that we must know them. We ask, why must we know, but it has no answer to give us. We must know that we may know.

Unjust laws have to be fought ideologically; they cannot be fought or corrected by means of mere disobedience and futile martyrdom.

Emotions are not tools of cognition. They tell you nothing about the nature of reality.

Man—every man—is an end in himself, not a means to the ends of others; he must live for his own sake, neither sacrificing himself to others nor sacrificing others to himself; he must work for his rational self-interest, with the achievement of his own happiness as the highest moral purpose of his life.

Censorship' is a term pertaining only to governmental action. No private action is censorship. No private individual or agency can silence a man or suppress a publication; only the government can do so. The freedom of speech of private individuals includes the right not to agree, not to listen and not to finance one's own antagonists.

When man learns to understand and control his own behavior as well as he is learning to understand and control the behavior of crop plants and domestic animals, he may be justified in believing that he has become civilized.

You don't know how hard I've tried to be left standing all by myself.