Every concept arises from the equation of unequal things. Just as it is certain that one leaf is never totally the same as another, so it is certain that the concept "leaf" is formed by arbitrarily discarding these individual differences and by forgetting the distinguishing aspects.

It is even a difficult thing for him [humans] to admit to himself that the insect or the bird perceives an entirely different world from the one that man does.

A painter without hands who wished to express in song the picture before his mind would, by means of this substitution of spheres, still reveal more about the essence of things than does the empirical world.

Brand is just a perception, and perception will match reality over time.

The so-called paradoxes of an author, to which a reader takes exception, often exist not in the author's book at all, but rather in the reader's head.

The man who sees little always sees less than there is to see; the man who hears badly always hears something more than there is to hear.