| Ludwig von Mises | Human action is purposeful behavior. | Human Action | p. 11; p. 11 | Action |
| Ludwig von Mises | Human life is an unceasing sequence of single actions. | Human Action | p. 45; p. 45 | Action |
| Ludwig von Mises | Action is purposive conduct. It is not simply behavior, but behavior begot by judgments of value, aiming at a definite end and guided by ideas concerning the suitability or unsuitability of definite means. . . . It is conscious behavior. It is choosing. It is volition; it is a display of the will. | The Ultimate Foundation of Economic Science | p. 34 | Action |
| Ludwig von Mises | Man thinks not only for the sake of thinking, but also in order to act. | Epistemological Problems of Economics | p. 37 | Action |
| Ludwig von Mises | Economics, as a branch of the more general theory of human action, deals with all human action, i.e., with mans purposive aiming at the attainment of ends chosen, whatever these ends may be. | Human Action | p. 880; p. 884 | Action |
| Ludwig von Mises | Action is a display of potency and control that are limited. It is a manifestation of man who is restrained by the circumscribed powers of his mind, the physiological nature of his body, the vicissitudes of his environment, and the scarcity of external factors on which his welfare depends. | Human Action | p. 70; p. 70 | Action |
| Ludwig von Mises | Action is an attempt to substitute a more satisfactory state of affairs for a less satisfactory one. We call such a willfully induced alteration an exchange. | Human Action | p. 97; p. 97 | Action |
| Ludwig von Mises | Most actions do not aim at anybodys defeat or loss. They aim at an improvement in conditions. | Human Action | p. 116; p. 116 | Action |
| Ludwig von Mises | The vigorous man industriously striving for the improvement of his condition acts neither more nor less than the lethargic man who sluggishly takes things as they come. For to do nothing and to be idle are also action, they too determine the course of events. | Human Action | p. 13; p. 13 | Action |
| Ludwig von Mises | Mans striving after an improvement of the conditions of his existence impels him to action. Action requires planning and the decision which of various plans is the most advantageous. | The Ultimate Foundation of Economic Science | p. 90 | Action |
| Ludwig von Mises | All rational action is in the first place individual action. Only the individual thinks. Only the individual reasons. Only the individual acts. | Socialism | p. 97 | Action |
| Ludwig von Mises | The fundamental thesis of rationalism is unassailable. Man is a rational being; that is, his actions are guided by reason. | Theory and History | p. 269 | Rational Action |
| Ludwig von Mises | Rational and irrational always mean: reasonable or not from the point of view of the ends sought. There is no such thing as absolute rationality or irrationality. | Omnipotent Government | p. 113 | Rational Action |
| Ludwig von Mises | The assertion that there is irrational action is always rooted in an evaluation of a scale of values different from our own. Whoever says that irrationality plays a role in human action is merely saying that his fellow men behave in a way that he does not consider correct. | Epistemological Problems of Economics | p. 33 | Rational Action |
| Ludwig von Mises | Rational conduct means that man, in face of the fact that he cannot satisfy all his impulses, desires, and appetites, forgoes the satisfaction of those which he considers less urgent. | Human Action | pp. 17172; p. 172 | Rational Action |
| Ludwig von Mises | Action is, by definition, always rational. One is unwarranted in calling goals of action irrational simply because they are not worth striving for from the point of view of ones own valuations. | Epistemological Problems of Economics | p. 35 | Rational Action |