Eucken's deepest, and consequently the most difficult, account of the meaning of religion is to be found in his Truth of Religion and his Kampf um einen geistigen Lebensinhalt. It is important to deal with the concept of the spiritual life at this stage of our inquiry, for it is the pivot around which the whole of Eucken's philosophy turns.
The essence of religion is conceived by him as the possession by man of an eternal existence in the midst of time; of the presence of an over-world in the midst of this world—guiding man to the revelation of a Divine Will.
This is Eucken's main thesis, and connected with this thesis is the fact that religion can come to birth in the soul of man only through a conquest of the ordinary, natural world which surrounds him. The world which surrounds him hinders more than it helps the birth of religion in the soul. The aim of religion is therefore not the perfecting of man in a natural sense, but the bringing about of a union of human nature and the Divine. Religion must therefore include a "world-denial and a world-renewal." There is not enough for man's deeper nature either in the physical world or in the ordinary life of the hour. The natural world knows of no complete self-subsistence, for everything is connected with its environment, and it is in this connection with its environment that life below man largely obtains its existence. But in man we discover a transition stage from the sensuous to the non-sensuous, and it is in the latter that the meaning of the former can be obtained. The history of civilisation and culture is a history of this all-important fact. The meaning of man is, therefore, not to be found in his relationship to the physical world, but in his own consciousness. Although we may not be aware of it, consciousness is the power which, in the long and slow progress of the ages, has overcome the sensuous and made it subservient to the meaning and value which its own content of experience has presented. The necessity and proof of religion are not then discovered in anything in the external world, but in the realisation of the fact that we are meant to be citizens of a world higher in its nature, the birthright of which is to be found within our own nature. The conquest of nature and the growth of culture are proofs to man of his superiority to the world of sense impressions. This denial of the sufficiency of the world of sense in the evolution of the human soul, on the one hand, and the affirmation of the potentiality of a higher world of spirit on the other hand, constitute the nucleus of the Christian religion. Its superiority consists in giving their rights to both worlds, and also in showing that they do not possess the same value. This essential nature of Christianity will be demonstrated later.
We must return, then, to consciousness itself and see what may be discovered within it concerning the meaning of religion. The great thinkers of the ages have all been agreed as to the impossibility of finding sufficient proofs and meanings of religion either from Nature or from some supernatural source flowing in a miraculous manner towards our earth. The growth and interpretation of natural science in modern times have rendered it impossible to find proofs of religion in any external mode. Yet the problems of man's Whence and Whither raise themselves with energy and even tragedy in our own day. These, as Eucken points out, are "problems concerning our Whence and Whither, our dependence upon strange powers, the painful antitheses within our own soul, the stubborn barriers to our spiritual potencies, the flaws in love and righteousness, in Nature and in human nature; in a word, the apparent total loss of what we dare not renounce—our best and most real treasures."[6] The loss takes place because we have been looking outward instead of inward for support, and prop after prop has given way. This is the situation to-day, and it has been brought about by no evil power, but by the gradual dawning of the meaning of things. Still, it is not the whole meaning of things, for, as Eucken points out: "But we are now experiencing what mankind has so often experienced, viz. that at the very point where the negation reaches its climax and the danger reaches the very brink of a precipice, the conviction dawns with axiomatic certainty that there lives and stirs within us something which no obstacle or enmity can ever destroy, and which signifies against all opposition a kernel of our nature that can never get lost."[7]
The religio-philosophical problem is, then, a return to the Whole of Life. It is here that any satisfactory answer can be found if found at all. It is necessary to investigate the final grounds as well as the most complete structure of Life; it is further necessary to discover whether the movement of Life necessarily leads to religion. As Eucken invariably presents the truth of religion, the meaning and significance of religion are to be found through self-consciousness. This meaning of consciousness is twofold in nature. On the one hand, it is something that may be known, and, on the other hand, it is something that is active through its own inherent energy. Here we find a difference between what we may know we are and what we are. Our knowledge of what we are, the conditions of what we are, the history of what we are—all these are a help for us to be what we are capable of becoming. But all these are not the very movement of the becoming itself. That movement is the resultant of the spiritual potency after experiences in the form of cognition have marked out the path for conation. This conation is an inheritance; it is present in the form of dissatisfaction with the present situation; it moves in the direction of a goal which is marked out by intellect. Now, however much this conation may be analysed, it resists being decomposed into a number of elements which make it up, for any such number, except in the very manner they are united, could not produce the situation. In other words, whatever the history of this conation may be, it is now a unity or whole. Conditioned as it is by the surrounding world and by its own history, in so far as it is this, it is determined; but it is still free in so far as it is capable of becoming a new point of departure for life and of proceeding on its way in a world of spirit. Unless man's nature contained within itself some unity or whole of the kind already referred to, it would mean no more than a receptacle of momentary impressions which would vanish as soon as their physical effects had passed away. But man is in reality more than all this. In the form of memory and experience he is able to hold together in a core of his being the meaning of these impressions after they have filtered into his consciousness. That is what we find, in however obscure a way, as the very beginning of every human life. This unity or whole, as already stated, may be no more than a potency in the beginning of life, but it gains in content and depth as it passes from impression to impression, and from experience to experience. And all further impressions and experiences have to be referred to this nucleus of the nature in order that they may be used and may prove themselves helpful. It is in this nucleus of the nature that everything obtains its meaning and value.
The Whole consequently grows, and gradually man becomes conscious of his personality as over against the environing world and even his own body. This consciousness of inwardness is of slow growth, because the natural tendency of life is to give a primary place to the world from which we have emerged—the world of physical existence, and also because much of that physical world reigns powerfully within our nature. But when reflection turns into itself, it becomes aware that the inwardness constitutes the kernel of a reality higher in its nature than anything either in the physical world or in the physical life which the man has to lead.
Two modes of reality now present themselves to the life, neither of which allows itself to be conceived of as an illusion. On the one hand, we find the physical world and our own physical nature. We discover that we cannot jump out of these without destroying all we possess; we have to come to some kind of understanding with the physical world and our own physical existence. Yet, on the other hand, the consciousness of a kernel of our being, non-sensuous and spiritual in its nature, has for ever broken our satisfaction with the physical world and our own physical existence. There are only two alternatives on which we can act. Either we are to conceive of our spiritual personality as something secondary and subsidiary to the natural world, or we are to insist on its independence, and acknowledge it as the beginning of a new mode of existence. If the former alternative is chosen, the personality can never pass to a state of self-subsistence, but will conceive of reality as something which is mainly physical. The consequence is that the personality will suffer seriously in its evolution, for such an evolution is brought about through the recognition and willing acknowledgment of the breaking forth of a new kind of reality within the spiritual nucleus of life. If the latter alternative is chosen, this nucleus of life is now seen as something quite other than a quality entirely dependent upon the physical or than a mere flowering of the physical; it is seen as a reality higher in its nature than the physical or even than the ordinary life of the individual. Such a situation is forced on man when once he reflects upon the inward meaning of the content of his consciousness. It is true that such questions may be thrust into the background, and consequently inhibited from presenting us with their full value and significance. And it is this which happens only too often in daily life. The constant need of attention to external things, the absorption of the mind in conventionality and custom as these present themselves in the form of a ready-made inheritance—all these occupy so much of the attention as to prevent man from knowing and experiencing what his own life is or what it is capable of becoming. Man has penetrated into the secrets of Nature as well as into the past of human society through close and constant attention to external things. He has been able to gather fragments together, piece them into each other, and through this frame laws concerning them. It is thus that the external world and society have come to mean more to a human being than to an animal. The animal is probably almost entirely the creature of its instincts and of the percepts which present themselves to it from moment to moment, and which largely disappear. But man rises above this situation. The external world and everything that has ever happened on its face are not merely objects external to himself, which contain all their qualities in themselves. Somebody has to experience all this, and that somebody that experiences all this is mental in his nature, however much this nature has been conditioned by physical things in the past or present.
Eucken emphasises this fundamental fact in all his books. Wherever a being is capable of experiencing impressions and of giving meanings to these, we are bound to conclude that the power which does this is something quite other than physical in its nature. It may be that such a power has never been known except in connection with what is physical; it may be that various chemical changes give the truer and clearer explanation of its origin, as far as its origin can be known at all; it may be that there was nothing of the mental visible in the early stages of its development; but all this is very different from stating that no potentiality for mental evolution was there. And it is this potentiality which is the issue at stake. We have no warrant for stating that it does not exist because it does not lend itself to be verified by the senses. Where does mind manifest itself to the senses? It is something which does not exist in space as a horse or a tree. It may be that consciousness has emanated from simple chemical beginnings and combinations, but it is not a simple or a chemical thing now. We divide worlds into inorganic and organic. The main principle of division is necessitated on account of the fact that some characteristics are present in the former which are absent in the latter. It is precisely the same between Body and Mind, with one difference. Body and Mind are indissolubly connected, but one cannot be reduced into the other. However much the connection on one side may influence the other side, the difference between a meaning and a thing remains. And it is this fundamental difference which makes it absolutely necessary to acknowledge a world of consciousness in contradistinction to a world of matter and its behaviour, whether such matter is to be found in the human body with its mechanical and chemical changes and transformations or in the physical universe outside our body.
It is only when the mind becomes aware of its own existence—an existence not to be established as being in Space (or entirely in Time) but as a reality subsisting in itself and in will-relations—that the efforts and fruitions of the spirit of man become intelligible at all. But such an awareness has become a permanent possession in a greater or less degree within the life of man. Whenever he becomes conscious of the fact that in his own soul a new phenomenon has made its appearance, he begins, after the willing acknowledgment of the reality of such a phenomenon, to exercise its potency over against the external world and over against much that is present in his own psychical life. A Higher and a Lower present themselves to him. The two alternatives force themselves, and there is no third: either this deeper kernel of his life must mean the possibility and, in a measure, the presence of a new land of reality; or, on the other hand, it means no more than a mere epiphenomenon and blossoming of the merely natural life. If the latter view is adopted, the spiritual nucleus of man's nature obtains but slight attention except on the side of its connection with the surrounding organic world, and consequently what this nucleus is in itself as an experience recedes into the background, and descriptions and explanations in scientific or philosophical form step into the foreground. But a contradiction is imbedded in this very account. Some kind of experience of life, apart from, and higher in its nature than, the connection of the spiritual nucleus with its physical history, persists in the life. The man of science is generally a good and worthy man. He believes in the moral life, and he does not throw the values of the centuries overboard. Such belief and valuation are not made up of the content of the explanation of life from its physical side, but are an unconscious acknowledgment of the presence of truths and values as experiences and as now subsisting in themselves, however much they are caused by physical things.
If, on the other hand, an acknowledgment of the reality of this spiritual life is made, new questions immediately arise. And the most fundamental of these questions have always been those farther removed from any sensuous or physical domain. They are questions concerning the value and meaning of life. It is a deep conviction of the reality of the deeper kernel of our being that alone constitutes the entrance to a new kind of world. But to acknowledge the presence of such a new world does not signify the possession of it simultaneously with the acknowledgment. The new world is discovered, but it is not yet possessed. There are terrible obstacles in the way; there are enemies without and within to be conquered. It is of little use entering into this struggle without an acknowledgment—born of an inward necessity—of the spiritual nucleus of our nature. Unless man has accustomed himself to hold fast to this "subtle thing termed spirit" he will soon be swamped in the region of the natural life once more; and when this happens the spiritual nucleus loses the consciousness of its own real subsistence as something higher in its nature than physical things or than the body and the ordinary life of the day. If the enterprise is to issue in anything that is great and good—into a spiritual world with an ever-growing content here and now—an insistence upon the reality of this deeper life coupled with the highest end which presents itself to the life must be made. Something is now seen in the distance as the meaning and value of life—something which our deeper nature longs for, and which has created a cleft within the soul between the ordinary things of sense and time and that which "never was on sea or land." It is something of this nature which Eucken discovers as the germ of all the spiritual ideas of religion as well as of the essence of religion itself. The Godhead, Eternity, Immortality, are concepts which arise within the soul through a consciousness of the inadequacy of all natural things and of even mental descriptions and explanations to answer and to satisfy the potency and longing of human nature.