Nietzschean affirmation (German: Bejahung) is a concept that has been scholarly identified in the philosophy of Friedrich Nietzsche. An example used to describe the concept is a fragment in Nietzsche's The Will to Power:
Suppose that we said yes to a single moment, then we have not only said yes to ourselves, but to the whole of existence. For nothing stands alone, either in ourselves or in things; and if our soul did but once vibrate and resound with a chord of happiness, then all of eternity was necessary to bring forth this one occurrence—and in this single moment when we said yes, all of eternity was embraced, redeemed, justified and affirmed.
— Nietzsche, Friedrich, The Will to Power: Selections from the Notebooks of the 1880s (translated by R. Kevin Hill and Michael A. Scarpitti). Penguin Books, 2017, p. 566[1]