"The will, as the thing-in-itself, constitutes the inner, true, and indestructible nature of man; yet in itself it is without consciousness. For consciousness is conditioned by the intellect, and the intellect is a mere accident of our being, for it is a function of the brain. The brain, together with the nerves and spinal cord attached to it, is a mere fruit, a product, in fact a parasite, of the rest of the organism, in so far as it is not directly geared to the organism's inner working, but serves the purpose of self-preservation by regulating its relations with the external world. On the other hand, the organism itself is the visibility, the objectivity, of the individual will, its image, as this image presents itself in that very brain (which in the first book we learned to recognize as the condition of the objective world in general)."