The interpretation of causality is an illusion.... A "thing" is the sum of its effects, synthetically united by means of a concept, an image. As a matter of fact, science has robbed the concept causality of all meaning, and has reserved it merely as an allegorical formula, which has made it a matter of indifference whether cause or effect be put on this side or on that. It is asserted that in two complex states (centres of force) the quantities of energy remain constant.
The calculability of a phenomenon does not lie in the fact that a rule is observed, or that a necessity is obeyed, or that we have projected a law of causality into every phenomenon: it lies in the recurrence of "identical cases."
There is no such thing as a sense of causality, as Kant would have us believe. We are aghast, we feel insecure, we will have something familiar, which can be relied upon.... As soon as we are shown the existence of something old in a new thing, we are pacified. The so-called instinct of causality is nothing more than the fear of the unfamiliar, and the attempt at finding something in it which is already known.—It is not a search for causes, but for the familiar.
552.
To combat determinism and teleology.—From the fact that something happens regularly, and that its occurrence may be reckoned upon, it does not follow that it happens necessarily. If a quantity of force determines and conducts itself in a certain way in every particular case, it does not prove that it has "no free will." "Mechanical necessity" is not an established fact: it was we who first read into the nature of all phenomena. We interpreted the possibility of formularising phenomena as a result of the dominion of necessary law over all existence. But it does not follow, because I do a determined thing, that I am bound to do it. Compulsion cannot be demonstrated in things: all that the rule proves is this, that one and the same phenomenon is not another phenomenon. Owing to the very fact that we fancied the existence of subjects "agents" in things, the notion arose that all phenomena are the consequence of a compulsory force exercised over the subject—exercised by whom? once more by an "agent." The concept "Cause and Effect" is a dangerous one, so long as people believe in something that causes, and a something that is caused.
(a) Necessity is not an established fact, but an interpretation.
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(b) When it is understood that the "subject" is nothing that acts, but only a thing of fancy, there is much that follows.
Only with the subject as model we invented thingness and read it into the pell-mell of sensations. If we cease from believing in the acting subject, the belief in acting things, in reciprocal action, in cause and effect between phenomena which we call things, also falls to pieces.
In this case the world of acting atoms also disappears: for this world is always assumed to exist on the pre-determined grounds that subjects are necessary.