Logic is not concerned with human behavior in the same sense that physiology, psychology, and social sciences are concerned with it. These sciences formulate laws or universal statements which have as their subject matter human activities as processes in time. Logic, on the contrary, is concerned with relations between factual sentences (or thoughts). If logic ever discusses the truth of factual sentences it does so only conditionally, somewhat as follows: if such-and-such a sentence is true, then such-and-such another sentence is true. Logic itself does not decide whether the first sentence is true, but surrenders that question to one or the other of the empirical sciences.
Rudolf CarnapRelated topics
human matter physiology psychology question sense somewhat truth universal relations Laws sciencesRelated quotes
Why is psychology the youngest of the empirical sciences? Why have we not long since discovered the unconscious and raised up its treasure-house of eternal images? Simply because we had a religious formula for everything psychic - and one that is far more beautiful and comprehensive than immediate experience. Though the Christian view of the world has paled for many people, the symbolic treasure-rooms of the East are still full of marvels that can nourish for a long time to come the passion for show and new clothes. What is more, these images - be they Christian or Buddhist or what you will - are lovely, mysterious, richly intuitive.
Carl Jung
Space is employed as the type even of the concept of time itself, representing it by a line, and its limits - moments - by points. Time, on the other had, approaches more to a universal and rational concept, comprising under its relations all things whatsoever, to wit, space itself, and besides, those accidents which are not comprehended in the relations of space, such as the thoughts of the soul. Again, time, besides this, though it certainly does not dictate the laws of reason, yet constitutes the principal conditions tinder favor of which the mind compares its notions according to the laws of reason. Thus, I cannot judge what is impossible except by predicating a and not-a of the same subject at the same time.
Immanuel Kant
Rights are, then, the fruits of the law, and of the law alone. There are no rights without law-no rights contrary to the law-no rights anterior to the law. Before the existence of laws there may be reasons for wishing that there were laws-and doubtless such reasons cannot be wanting, and those of the strongest kind;-but a reason for wishing that we possessed a right, does not constitute a right. To confound the existence of a reason for wishing that we possessed a right, with the existence of the right itself, is to confound the existence of a want with the means of relieving it. It is the same as if one should say, everybody is subject to hunger, therefore everybody has something to eat.
Jeremy Bentham
There should be open competition for all men; and the most able should not be prevented by laws or customs from succeeding best and rearing the largest number of offspring. Important as the struggle for existence has been and even still is, yet as far as the highest part of man's nature is concerned there are other agencies more important. For the moral qualities are advanced, either directly or indirectly, much more through the effects of habit, the reasoning powers, instruction, religion, &c., than through natural selection; though to this latter agency the social instincts, which afforded the basis for the development of the moral sense, may be safely attributed.
Charles Darwin
What is the "cost of capital" to a, firm in a world in which funds are used to acquire assets whose yields are uncertain; and in which capital can be obtained by many different media, ranging from pure debt instruments, representing money-fixed claims, to pure equity issues, giving holders only the right to a pro-rata share in the uncertain venture? This question has vexed at least three classes of economists: (1) the corporation finance specialist concerned with the techniques of financing firms so as to ensure their survival and growth; (2) the managerial economist concerned with capital budgeting; and (3) the economic theorist concerned with explaining investment behavior at both the micro and macro levels.
Merton Miller