Our senses have a certain definite quantum as a mean, within the limits of which they perform their functions—that is to say, we become conscious of bigness and smallness in accordance with the conditions of our existence. If we sharpened or blunted our senses tenfold, we should perish—that is to say, we feel even proportions as qualities in regard to our possibilities of existence.
564.
But could not all quantities be merely tokens of qualities? Another consciousness and scale of desires must correspond to greater power in fact, another point of view; growth in itself is the expression of a desire to become more; the desire for a greater quantum springs from a certain quale, in a purely quantitative world, everything would be dead, stiff, and motionless.—The reduction of all qualities to quantities is nonsense: it is discovered that they can only stand together, an analogy—
565.
Qualities are our insurmountable barriers; we cannot possibly help feeling mere differences of quantity as something fundamentally different from quantity—that is to say, as qualities, which we can no longer reduce to terms of quantity. But everything in regard to which the word "knowledge" has any sense at all, belongs to the realm of reckoning, weighing, and measuring, to quantity whereas, conversely, all our valuations (that is to say, our sensations) belong precisely to the realm of qualities, i.e. to those truths which belong to us alone and to our point of view, and which absolutely cannot be "known." It is obvious that every one of us, different creatures, must feel different qualities, and must therefore live in a different world from the rest. Qualities are an idiosyncrasy proper to human nature; the demand that these our human interpretations and values, should be general and perhaps real values, belongs to the hereditary madnesses of human pride.
566.
The "real world," in whatever form it has been conceived hitherto—was always the world of appearance over again.
567.
The world of appearance, i.e. a world regarded in the light of values; ordered, selected according to values—that is to say, in this case, according to the standpoint of utility in regard to the preservation and the increase of power of a certain species of animals.
It is the point of view, then, which accounts for the character of "appearance." As if a world could remain over, when the point of view is cancelled! By such means relativity would also be cancelled!