" Among the enormous multiplicity of phenomena to be observed in an organic being, that part which becomes conscious is a mere means: and the particle of "virtue," "self abnegation," and other fanciful inventions, are denied in a most thoroughgoing manner by the whole of the remaining phenomena. We would do well to study our organism in all its immorality....

The animal functions are, as a matter of fact, a million times more important than all beautiful states of the soul and heights of consciousness: the latter are an overflow, in so far as they are not needed as instruments in the service of the animal functions. The whole of conscious life: the spirit together with the soul, the heart, goodness, and virtue; in whose service does it work? In the greatest possible perfection of the means (for acquiring nourishment and advancement) serving the fundamental animal functions: above all, the ascent of the line of Life.

That which is called "flesh" and "body" is of such incalculably greater importance, that the rest is nothing more than a small appurtenance. To continue the chain of life so that it becomes ever more powerful—that is the task.

But now observe how the heart, the soul, virtue, and spirit together conspire formally to thwart this purpose: as if they were the object of every endeavour! ... The degeneration of life is essentially determined by the extraordinary fallibility of consciousness, which is held at bay least of all by the instincts, and thus commits the gravest and profoundest errors.

Now could any more insane extravagance of vanity be imagined than to measure the value of existence according to the pleasant or unpleasant feelings of this consciousness? It is obviously only a means: and pleasant or unpleasant feelings are also no more than means.
According to what standard is the objective value measured? According to the quantity of increased and more organised power alone. "

― Friedrich Nietzsche , The Will to Power