Man is not, like the animals, an obsequious puppet of instincts and sensual impulses. Man has the power to suppress instinctive desires, he has a will of his own, he chooses between incompatible ends. In this sense he is a moral person; in this sense he is free.

All that happens was, under the prevailing conditions, bound to happen. It happened because the forces operating on its production were more powerful than the counteracting forces. Its happening was, in this sense, inevitable.

Negation, the notion of the absence or nonexistence of something or of the denial of a proposition, is conceivable to the human mind. But the notion of an absolute negation of everything, the representation of an absolute nothing, is beyond man’s comprehension. So is the notion of the emergence of something out of nothing, the notion of an absolute beginning. The Lord, teaches the Bible, created the world out of nothing; but God himself was there from eternity and will be there in eternity, without a beginning and without an end.

It follows that scientific research will never succeed in providing a full answer to what is called the riddles of the universe. It can never show how out of an inconceivable nothing emerged all that is and how one day all that exists may again disappear and the “nothing” alone will remain.

Statistics is the description in numerical terms of experiences concerning phenomena not subject to regular uniformity. As far as there is discernible regularity in the succession of phenomena, no recourse to statistics is needed. The objective of vital statistics is not to establish the fact that all men are mortal, but to give information about the length of human life, a magnitude that is not uniform. Statistics is therefore a specific method of history.

Praxeology is a priori. All its theorems are products of deductive reasoning that starts from the category of action. The questions whether the judgments of praxeology are to be called analytic or synthetic and whether or not its procedure is to be qualified as “merely” tautological are of verbal interest only.

History in the broadest sense of the term is the totality of human experience. History is experience, and all experience is historical. History comprehends also all the experience of the natural sciences. What characterizes the natural sciences as such is the fact that they approach the material of experience with the category of a strict regularity in the succession of events. History in the narrower sense of the term, i.e., the totality of experience concerning human action, must not and does not refer to this category.

The environment in which man acts is shaped by natural events on the one hand and by human action on the other. The future for which he plans will be codetermined by the actions of people who are planning and acting like himself. If he wants to succeed, he must anticipate their conduct.

The characteristic feature of man is action. Man aims at changing some of the conditions of his environment in order to substitute a state of affairs that suits him better for another state that suits him less. All manifestations of life and behavior with regard to which man differs from all other beings and things known to him are instances of action and can be dealt with only from what we may call an activistic point of view. The study of man, as far as it is not biology, begins and ends with the study of human action.