Passing now to other levels of experience — life and consciousness. Consciousness may be imagined as a deflection from life. Its function is to provide a luminous point in order to enlighten the forward rush of life. It is a case of tension, a state of self-concentration, by means of which life manages to shut out all memories and associations which have no bearing on a present action. It has no well-defined fringes; it shrinks and expands as the occasion demands. To describe it as an epiphenomenon of the processes of matter is to deny it as an independent activity, and to deny it as an independent activity is to deny the validity of all knowledge which is only a systematized expression of consciousness. Thus consciousness is a variety of the purely spiritual principle of life which is not a substance, but an organizing principle, a specific mode of behaviour essentially different to the behaviour of an externally worked machine.
Since, however, we cannot conceive of a purely spiritual energy, except in association with a definite combination of sensible elements through which it reveals itself, we are apt to take this combination as the ultimate ground of spiritual energy. The discoveries of Newton in the sphere of matter and those of Darwin in the sphere of Natural History reveal a mechanism. All problems, it was believed, were really the problems of physics. Energy and atoms, with the properties self-existing in them, could explain everything including life, thought, will, and feeling. The concept of mechanism — a purely physical concept — claimed to be the all-embracing explanation of Nature. And the battle for and against mechanism is still being fiercely fought in the domain of Biology. The question, then, is whether the passage to Reality through the revelations of sense-perception necessarily leads to a view of Reality essentially opposed to the view that religion takes of its ultimate character. Is Natural Science finally committed to materialism?
There is no doubt that the theories of science constitute trustworthy knowledge, because they are verifiable and enable us to predict and control the events of Nature. But we must not forget that what is called science is not a single systematic view of Reality. It is a mass of sectional views of Reality — fragments of a total experience which do not seem to fit together. Natural Science deals with matter, with life, and with mind; but the moment you ask the question how matter, life, and mind are mutually related, you begin to see the sectional character of the various sciences that deal with them and the inability of these sciences, taken singly, to furnish a complete answer to your question. In fact, the various natural sciences are like so many vultures falling on the dead body of Nature, and each running away with a piece of its flesh. Nature as the subject of science is a highly artificial affair, and this artificiality is the result of that selective process to which science must subject her in the interests of precision. The moment you put the subject of science in the total of human experience it begins to disclose a different character. Thus religion, which demands the whole of Reality and for this reason must occupy a central place in any synthesis of all the data of human experience, has no reason to be afraid of any sectional views of Reality. Natural Science is by nature sectional; it cannot, if it is true to its own nature and function, set up its theory as a complete view of Reality.
The concepts we use in the organization of knowledge are, therefore, sectional in character, and their application is relative to the level of experience to which they are applied. The concept of ‘cause’, for instance, the essential feature of which is priority to the effect, is relative to the subject-matter of physical science which studies one special kind of activity to the exclusion of other forms of activity observed by others. When we rise to the level of life and mind the concept of cause fails us, and we stand in need of concepts of a different order of thought. The action of living organisms, initiated and planned in view of an end, is totally different to causal action. The subject-matter of our inquiry, therefore, demands the concepts of ‘end’ and ‘purpose’, which act from within unlike the concept of cause which is external to the effect and acts from without. No doubt, there are aspects of the activity of a living organism which it shares with other objects of Nature. In the observation of these aspects the concepts of physics and chemistry would be needed; but the behaviour of the organism is essentially a matter of inheritance and incapable of sufficient explanation in terms of molecular physics. However, the concept of mechanism has been applied to life and we have to see how far the attempt has succeeded.
Unfortunately, I am not a biologist and must turn to biologists themselves for support. After telling us that the main difference between a living organism and a machine is that the former is self-maintaining and self-reproducing, J.S. Haldane says:
‘It is thus evident that although we find within the living body many phenomena which, so long as we do not look closely, can be interpreted satisfactorily as physical and chemical mechanism, there are side by side other phenomena [i.e. self-maintenance and reproduction] for which the possibility of such interpretation seems to be absent. The mechanists assume that the bodily mechanisms are so constructed as to maintain, repair, and reproduce themselves. In the long process of natural selection, mechanisms of this sort have, they suggest, been evolved gradually. Let us examine this hypothesis. When we state an event in mechanical terms we state it as a necessary result of certain simple properties of separate parts which interact in the event. . . . The essence of the explanation or re-statement of the event is that after due investigation we have assumed that the parts interacting in the event have certain simple and definite properties, so that they always react in the same way under the same conditions. For a mechanical explanation the reacting parts must first be given. Unless an arrangement of parts with definite properties is given, it is meaningless to speak of mechanical explanation. To postulate the existence of a self-producing or self-maintaining mechanism is, thus, to postulate something to which no meaning can be attached. Meaningless terms are sometimes used by physiologists; but there is none so absolutely meaningless as the expression “mechanism of reproduction”. Any mechanism there may be in the parent organism is absent in the process of reproduction, and must reconstitute itself at each generation, since the parent organism is reproduced from a mere tiny speck of its own body. There can be no mechanism of reproduction. The idea of a mechanism which is constantly maintaining or reproducing its own structure is self-contradictory. A mechanism which reproduced itself would be a mechanism without parts, and, therefore, not a mechanism.’
Life is, then, a unique phenomenon and the concept of mechanism is inadequate for its analysis. Its ‘factual wholeness’, to use an expression of Driesch — another notable biologist — is a kind of unity which, looked at from another point of view, is also a plurality. In all the purposive processes of growth and adaptation to its environment, whether this adaptation is secured by the formation of fresh or the modification of old habits, it possesses a career which is unthinkable in the case of a machine. And the possession of a career means that the sources of its activity cannot be explained except in reference to a remote past, the origin of which, therefore, must be sought in a spiritual reality revealable in, but non-discoverable by, any analysis of spatial experience. It would, therefore, seem that life is foundational and anterior to the routine of physical and chemical processes which must be regarded as a kind of fixed behaviour formed during a long course of evolution. Further, the application of the mechanistic concepts to life, necessitating the view that the intellect itself is a product of evolution, brings science into conflict with its own objective principle of investigation. On this point I will quote a passage from Wildon Carr, who has given a very pointed expression to this conflict:
‘If intellect is a product of evolution the whole mechanistic concept of the nature and origin of life is absurd, and the principle which science has adopted must clearly be revised. We have only to state it to see the self-contradiction. How can the intellect, a mode of apprehending reality, be itself an evolution of something which only exists as an abstraction of that mode of apprehending, which is the intellect? If intellect is an evolution of life, then the concept of the life which can evolve intellect as a particular mode of apprehending reality must be the concept of a more concrete activity than that of any abstract mechanical movement which the intellect can present to itself by analysing its apprehended content. And yet further, if the intellect be a product of the evolution of life, it is not absolute but relative to the activity of the life which has evolved it; how then, in such case, can science exclude the subjective aspect of the knowing and build on the objective presentation as an absolute? Clearly the biological sciences necessitate a reconsideration of the scientific principle.’