It is a matter of mere experience that change never ceases: at bottom we have not the smallest grounds for assuming that any one particular change must follow upon any other. On the contrary, any state which has been attained would seem almost forced to maintain itself intact if it had not within itself a capacity for not desiring to maintain itself.... Spinoza's proposition concerning "self-preservation" ought as a matter of fact to put a stop to change. But the proposition is false; the contrary is true. In all living organisms it can be clearly shown that they do everything not to remain as they are, but to become greater....
689.
"Will to power" and causality.—From a psychological point of view the idea of "cause" is our feeling of power in the act which is called willing—our concept effect is the superstition that this feeling of power is itself the force which moves things....
A state which accompanies an event and is already an effect of that event is deemed "sufficient cause" of the latter; the tense relationship of our feeling of power (pleasure as the feeling of power) and of an obstacle being overcome—are these things illusions?
If we translate the notion "cause" back into the only sphere which is known to us, and out of which we have taken it, we cannot imagine any change in which the will to power is not inherent. We do not know how to account for any change which is not a trespassing of one power on another.
Mechanics only show us the results, and then only in images (movement is a figure of speech); gravitation itself has no mechanical cause, because it is itself the first cause of mechanical results.
The will to accumulate force is confined to the phenomenon of life, to nourishment, to procreation, to inheritance, to society, states, customs, authority. Should we not be allowed to assume that this will is the motive power also of chemistry?—and of the cosmic order?
Not only conservation of energy, but the minimum amount of waste; so that the only reality is this: the will of every centre of power to become stronger—not self-preservation, but the desire to appropriate, to become master, to become more, to become stronger.
Is the fact that science is possible a proof of the principle of causation—"From like causes, like effects"—"A permanent law of things"—"Invariable order"? Because something is calculable, is it therefore on that account necessary?
If something happens thus, and thus only, it is not the manifestation of a "principle," of a "law," of "order." What happens is that certain quanta of power begin to operate, and their essence is to exercise their power over all other quanta of power. Can we assume the existence of a striving after power without a feeling of pleasure and pain, i.e. without the sensation of an increase or a decrease of power? Is mechanism only a language of signs for the concealed fact of a world of fighting and conquering quanta of will-power? All mechanical first-principles, matter, atoms, weight, pressure, and repulsion, are not facts in themselves, but interpretations arrived at with the help of psychical fictions.