Human, All Too Human · Friedrich Wilhelm Nietzsche
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Between the moments in which we are conscious of this relation, (the states of feeling) lie the moments of rest, of not-feeling: then the world and every thing (Ding) have no interest for us: we observe no change in them (as at present a person absorbed in something does not notice anyone passing by). To plants all things are, as a rule, at rest, eternal, every object like itself. From the period of lower organisms has been handed down to man the belief that there are like things (gleiche Dinge): only the trained experience attained through the most advanced science contradicts this postulate. The primordial belief of all organisms is, perhaps, that all the rest of the world is one thing and motionless.--Furthest away from this first step towards the logical is the notion of causation: even to-day we think that all our feelings and doings are, at bottom, acts of the free will; when the sentient individual contemplates himself he deems every feeling, every change, a something isolated, disconnected, that is to say, unqualified by any thing; it comes suddenly to the surface, independent of anything that went before or came after. We are hungry, but originally we do not know that the organism must be nourished: on the contrary that feeling seems to manifest itself without reason or purpose; it stands out by itself and seems quite independent. Therefore: the belief in the freedom of the will is a primordial error of everything organic as old as the very earliest inward prompting of the logical faculty; belief in unconditioned substances and in like things (gleiche Dinge) is also a primordial and equally ancient error of everything organic. Inasmuch as all metaphysic has concerned itself particularly with substance and with freedom of the will, it should be designated as the science that deals with the fundamental errors of mankind as if they were fundamental truths.
Text from Project Gutenberg, public domain in the United States.