Nietzsche breaks sharply with Schopenhauer and the Darwinians who place self-preservation at the centre of life. Survival is merely a consequence, not an end. What every living thing actually seeks is discharge of its strength, the expression of power — and that expression may just as readily be self-expenditure as self-preservation. The weak preserve; the strong overflow.
The most precise formulation of will to power comes in Chapter IX, where Nietzsche treats exploitation not as a social pathology but as a biological fact. Any living body — individual, community, or organism — that refrains from acting on its strength is in decline. The will to power is not cruelty for its own sake but the natural expression of vitality: to organise, to incorporate, to give form.
Nietzsche extends will to power beyond physiology into psychology, epistemology, and art. The philosopher who seeks truth, the artist who creates form, the priest who interprets suffering — all are expressions of will to power, differing only in direction and quality. Even asceticism, the apparent denial of power, is a will turned inward, a power over oneself. The question Nietzsche presses is not whether one has will to power, but what kind.
The will to power should not be confused with political authoritarianism; Nietzsche explicitly opposes the state and treats the desire for mere political dominance as a symptom of weakness rather than strength.
