It will be noted that in my analysis of "sensation" I have said nothing of what are usually called "the five senses." These senses are obviously the material "feelers" or the gates of material sentiency by which the soul's attribute of sensation feeds itself from the objective world; but they are so penetrated and percolated, through and through, by the other basic activities of the soul, that it is extremely difficult to disentangle from our impressions of sight, of sound, of touch, of taste, and of smell, those interwoven threads of reason, imagination and so forth which so profoundly modify and transmute, even in the art of seeing, hearing, touching, tasting, and smelling, the various manifestations of "the objective mystery" which we apprehend in our sensuous grasp.
By emphasizing the feelings of pleasure and pain as the primary characteristics of the attribute of sensation we are indicating the fact that every sensation we experience carries with it in some perceptible degree or other, the feeling of "well-being" or the feeling of distress.
We now come to consider that dim, obscure, but nevertheless powerful energy, which the universal tradition of language dignifies by the name of "instinct." This "instinct" is the portion of the activity of the soul which works more blindly and less consciously than any other.
The French philosopher Bergson isolates and emphasizes this subterranean activity until it seems to him to hold in its grasp a deeper secret of life than any other energy which man possesses To secure for instinct this primary place in the panorama of life it is necessary to eliminate from the situation that silent witness which we call "the mind" or self-consciousness; that witness which from its invisible watch-tower looks forth upon the whole spectacle. It is necessary to take for granted the long historic stream of evolutionary development. It is necessary to regard this development in its organic totality as the sole reality with which we have to deal.
The invisible mental witness being eliminated, it becomes necessary, if instinct is to be thus made supreme, to regard the appearance of the soul as a mere stage in an evolutionary process, the driving-force of which is the power of instinct itself. Planets and plants, men and animals, are seen in this way to be all dominated by instinct; and instinct is found to be so much the most important element in evolution, that upon it, rather than upon anything else, the whole future of the universe may be said to depend.