structural:expansion
Nietzsche (1844–1900)

Friedrich Nietzsche believed the search for truth, or 'the will to truth', was a consequence of the will to power of philosophers. He thought that truth should be used as long as it promoted life and the will to power, and he thought untruth was better than truth if it had this life enhancement as a consequence. As he wrote in Beyond Good and Evil, "The falseness of a judgment is to us not necessarily an objection to a judgment... The question is to what extent it is life-advancing, life-preserving, species-preserving, perhaps even species-breeding..." (aphorism 4). He proposed the will to power as a truth only because, according to him, it was the most life-affirming and sincere perspective one could have.

Robert Wicks discusses Nietzsche's basic view of truth as follows:

Some scholars regard Nietzsche's 1873 unpublished essay, "On Truth and Lies in a Nonmoral Sense" ("Über Wahrheit und Lüge im außermoralischen Sinn") as a keystone in his thought. In this essay, Nietzsche rejects the idea of universal constants, and claims that what we call "truth" is only "a mobile army of metaphors, metonyms, and anthropomorphisms." His view at this time is that arbitrariness completely prevails within human experience: concepts originate via the very artistic transference of nerve stimuli into images; "truth" is nothing more than the invention of fixed conventions for merely practical purposes, especially those of repose, security and consistence.

Separately Nietzsche suggested that an ancient, metaphysical belief in the divinity of Truth lies at the heart of and has served as the foundation for the entire subsequent Western intellectual tradition: "But you will have gathered what I am getting at, namely, that it is still a metaphysical faith on which our faith in science rests—that even we knowers of today, we godless anti-metaphysicians still take our fire too, from the flame lit by the thousand-year old faith, the Christian faith which was also Plato's faith, that God is Truth; that Truth is 'Divine'..."

Moreover, Nietzsche challenges the notion of objective truth, arguing that truths are human creations and serve practical purposes. He wrote, "Truths are illusions about which one has forgotten that this is what they are." He argues that truth is a human invention, arising from the artistic transference of nerve stimuli into images, serving practical purposes like repose, security, and consistency; formed through metaphorical and rhetorical devices, shaped by societal conventions and forgotten origins:

"What, then, is truth? A mobile army of metaphors, metonyms, and anthropomorphisms – in short, a sum of human relations which have been enhanced, transposed, and embellished poetically and rhetorically..."

Nietzsche argues that truth is always filtered through individual perspectives and shaped by various interests and biases. In "On the Genealogy of Morality," he asserts, "There are no facts, only interpretations." He suggests that truth is subject to constant reinterpretation and change, influenced by shifting cultural and historical contexts as he writes in "Thus Spoke Zarathustra" that "I say unto you: one must still have chaos in oneself to be able to give birth to a dancing star." In the same book, Zarathustra proclaims, "Truths are illusions which we have forgotten are illusions; they are metaphors that have become worn out and have been drained of sensuous force, coins which have lost their embossing and are now considered as metal and no longer as coins."