This change of human disposition toward the world does not mean that man ceases to have ideals, or ceases to be primarily a creature of the imagination. But it does signify a radical change in the character and function of the ideal realm which man shapes for himself. In the classic philosophy, the ideal world is essentially a haven in which man finds rest from the storms of life; it is an asylum in which he takes refuge from the troubles of existence with the calm assurance that it alone is supremely real. When the belief that knowledge is active and operative takes hold of men, the ideal realm is no longer something aloof and separate; it is rather that collection of imagined possibilities that stimulates men to new efforts and realizations. It still remains true that the troubles which men undergo are the forces that lead them to project pictures of a better state of things. But the picture of the better is shaped so that it may become an instrumentality of action, while in the classic view the Idea belongs ready-made in a noumenal world. Hence, it is only an object of personal aspiration or consolation, while to the modern, an idea is a suggestion of something to be done or of a way of doing.

An illustration will, perhaps, make the difference clear. Distance is an obstacle, a source of trouble. It separates friends and prevents intercourse. It isolates, and makes contact and mutual understanding difficult. This state of affairs provokes discontent and restlessness; it excites the imagination to construct pictures of a state of things where human intercourse is not injuriously affected by space. Now there are two ways out. One way is to pass from a mere dream of some heavenly realm in which distance is abolished and by some magic all friends are in perpetual transparent communication, to pass, I say, from some idle castle-building to philosophic reflection. Space, distance, it will then be argued, is merely phenomenal; or, in a more modern version, subjective. It is not, metaphysically speaking, real. Hence the obstruction and trouble it gives is not after all "real" in the metaphysical sense of reality. Pure minds, pure spirits, do not live in a space world; for them distance is not. Their relationships in the true world are not in any way affected by special considerations. Their intercommunication is direct, fluent, unobstructed.

Does the illustration involve a caricature of ways of philosophizing with which we are all familiar? But if it is not an absurd caricature, does it not suggest that much of what philosophies have taught about the ideal and noumenal or superiorly real world, is after all, only casting a dream into an elaborate dialectic form through the use of a speciously scientific terminology? Practically, the difficulty, the trouble, remains. Practically, however it may be "metaphysically," space is still real:—it acts in a definite objectionable way. Again, man dreams of some better state of things. From troublesome fact he takes refuge in fantasy. But this time, the refuge does not remain a permanent and remote asylum.

The idea becomes a standpoint from which to examine existing occurrences and to see if there is not among them something which gives a hint of how communication at a distance can be effected, something to be utilized as a medium of speech at long range. The suggestion or fancy though still ideal is treated as a possibility capable of realization in the concrete natural world, not as a superior reality apart from that world. As such, it becomes a platform from which to scrutinize natural events. Observed from the point of view of this possibility, things disclose properties hitherto undetected. In the light of these ascertainments, the idea of some agency for speech at a distance becomes less vague and floating: it takes on positive form. This action and reaction goes on. The possibility or idea is employed as a method for observing actual existence; and in the light of what is discovered the possibility takes on concrete existence. It becomes less of a mere idea, a fancy, a wished-for possibility, and more of an actual fact. Invention proceeds, and at last we have the telegraph, the telephone, first through wires, and then with no artificial medium. The concrete environment is transformed in the desired direction; it is idealized in fact and not merely in fancy. The ideal is realized through its own use as a tool or method of inspection, experimentation, selection and combination of concrete natural operations.

Let us pause to take stock of results. The division of the world into two kinds of Being, one superior, accessible only to reason and ideal in nature, the other inferior, material, changeable, empirical, accessible to sense-observation, turns inevitably into the idea that knowledge is contemplative in nature. It assumes a contrast between theory and practice which was all to the disadvantage of the latter. But in the actual course of the development of science, a tremendous change has come about. When the practice of knowledge ceased to be dialectical and became experimental, knowing became preoccupied with changes and the test of knowledge became the ability to bring about certain changes. Knowing, for the experimental sciences, means a certain kind of intelligently conducted doing; it ceases to be contemplative and becomes in a true sense practical. Now this implies that philosophy, unless it is to undergo a complete break with the authorized spirit of science, must also alter its nature. It must assume a practical nature; it must become operative and experimental. And we have pointed out what an enormous change this transformation of philosophy entails in the two conceptions which have played the greatest rôle in historic philosophizing—the conceptions of the "real" and "ideal" respectively. The former ceases to be something ready-made and final; it becomes that which has to be accepted as the material of change, as the obstructions and the means of certain specific desired changes. The ideal and rational also ceased to be a separate ready-made world incapable of being used as a lever to transform the actual empirical world, a mere asylum from empirical deficiencies. They represent intelligently thought-out possibilities of the existent world which may be used as methods for making over and improving it.

Philosophically speaking, this is the great difference involved in the change from knowledge and philosophy as contemplative to operative. The change does not mean the lowering in dignity of philosophy from a lofty plane to one of gross utilitarianism. It signifies that the prime function of philosophy is that of rationalizing the possibilities of experience, especially collective human experience. The scope of this change may be realized by considering how far we are from accomplishing it. In spite of inventions which enable men to use the energies of nature for their purposes, we are still far from habitually treating knowledge as the method of active control of nature and of experience. We tend to think of it after the model of a spectator viewing a finished picture rather than after that of the artist producing the painting. Thus there arise all the questions of epistemology with which the technical student of philosophy is so familiar, and which have made modern philosophy in especial so remote from the understanding of the everyday person and from the results and processes of science. For these questions all spring from the assumption of a merely beholding mind on one side and a foreign and remote object to be viewed and noted on the other. They ask how a mind and world, subject and object, so separate and independent can by any possibility come into such relationship to each other as to make true knowledge possible. If knowing were habitually conceived of as active and operative, after the analogy of experiment guided by hypothesis, or of invention guided by the imagination of some possibility, it is not too much to say that the first effect would be to emancipate philosophy from all the epistemological puzzles which now perplex it. For these all arise from a conception of the relation of mind and world, subject and object, in knowing, which assumes that to know is to seize upon what is already in existence.

Modern philosophic thought has been so preoccupied with these puzzles of epistemology and the disputes between realist and idealist, between phenomenalist and absolutist, that many students are at a loss to know what would be left for philosophy if there were removed both the metaphysical task of distinguishing between the noumenal and phenomenal worlds and the epistemological task of telling how a separate subject can know an independent object. But would not the elimination of these traditional problems permit philosophy to devote itself to a more fruitful and more needed task? Would it not encourage philosophy to face the great social and moral defects and troubles from which humanity suffers, to concentrate its attention upon clearing up the causes and exact nature of these evils and upon developing a clear idea of better social possibilities; in short upon projecting an idea or ideal which, instead of expressing the notion of another world or some far-away unrealizable goal, would be used as a method of understanding and rectifying specific social ills?

This is a vague statement. But note in the first place that such a conception of the proper province of philosophy where it is released from vain metaphysics and idle epistemology is in line with the origin of philosophy sketched in the first hour. And in the second place, note how contemporary society, the world over, is in need of more general and fundamental enlightenment and guidance than it now possesses. I have tried to show that a radical change of the conception of knowledge from contemplative to active is the inevitable result of the way in which inquiry and invention are now conducted. But in claiming this, it must also be conceded, or rather asserted, that so far the change has influenced for the most part only the more technical side of human life. The sciences have created new industrial arts. Man's physical command of natural energies has been indefinitely multiplied. There is control of the sources of material wealth and prosperity. What would once have been miracles are now daily performed with steam and coal and electricity and air, and with the human body. But there are few persons optimistic enough to declare that any similar command of the forces which control man's social and moral welfare has been achieved.

Where is the moral progress that corresponds to our economic accomplishments? The latter is the direct fruit of the revolution that has been wrought in physical science. But where is there a corresponding human science and art? Not only has the improvement in the method of knowing remained so far mainly limited to technical and economic matters, but this progress has brought with it serious new moral disturbances. I need only cite the late war, the problem of capital and labor, the relation of economic classes, the fact that while the new science has achieved wonders in medicine and surgery, it has also produced and spread occasions for diseases and weaknesses. These considerations indicate to us how undeveloped are our politics, how crude and primitive our education, how passive and inert our morals. The causes remain which brought philosophy into existence as an attempt to find an intelligent substitute for blind custom and blind impulse as guides to life and conduct. The attempt has not been successfully accomplished. Is there not reason for believing that the release of philosophy from its burden of sterile metaphysics and sterile epistemology instead of depriving philosophy of problems and subject-matter would open a way to questions of the most perplexing and the most significant sort?

Let me specify one problem quite directly suggested by certain points in this lecture. It has been pointed out that the really fruitful application of the contemplative idea was not in science but in the esthetic field. It is difficult to imagine any high development of the fine arts except where there is curious and loving interest in forms and motions of the world quite irrespective of any use to which they may be put. And it is not too much to say that every people that has attained a high esthetic development has been a people in which the contemplative attitude has flourished—as the Greek, the Hindoo, the medieval Christian. On the other hand, the scientific attitude that has actually proved itself in scientific progress is, as has been pointed out, a practical attitude. It takes forms as disguises for hidden processes. Its interest in change is in what it leads to, what can be done with it, to what use it can be put. While it has brought nature under control, there is something hard and aggressive in its attitude toward nature unfavorable to the esthetic enjoyment of the world. Surely there is no more significant question before the world than this question of the possibility and method of reconciliation of the attitudes of practical science and contemplative esthetic appreciation. Without the former, man will be the sport and victim of natural forces which he cannot use or control. Without the latter, mankind might become a race of economic monsters, restlessly driving hard bargains with nature and with one another, bored with leisure or capable of putting it to use only in ostentatious display and extravagant dissipation.