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"Our topic is the essence of truth. The question regarding the essence of truth is not concerned with whether truth is a truth of practical experience or of economic calculation, the truth of a technical consideration or of political sagacity, or, in particular, a truth of scientific research or of artistic composition, or even the truth of thoughtful reflection or of cultic belief. The question of essence disregards all this and attends to the one thing that in general distinguishes every “truth” as truth.

Über Wahrheit und Lüge im außermoralischen Sinn (in English: "On Truth and Lies in a Nonmoral Sense", also called "On Truth and Lie in an Extra-Moral Sense") is an (initially) unpublished work of Friedrich Nietzsche, written, if not published, in the year following The Birth of Tragedy; 1873.

"Walter Bendix Schönflies Benjamin (July 15, 1892 – September 27, 1940) was a German-Jewish Marxist literary critic, essayist, translator, and philosopher. He was at times associated with the Frankfurt School of critical theory and was also greatly inspired by the Marxism of Bertolt Brecht and Jewish mysticism as presented by Gershom Scholem."

"Gottfried Wilhelm Leibniz (also Leibnitz or von Leibniz (July 1 (June 21 Old Style) 1646 – November 14, 1716) was a German polymath who wrote primarily in Latin and French.

"The Monadology (Monadologie, 1714) is one of Gottfried Leibniz’s works that best define his philosophy, monadism. Written toward the end of his life in order to support a metaphysics of simple substances, the Monadology is thus about formal atoms which are not physical but metaphysical."

"Novalis was the pseudonym of Georg Philipp Friedrich Freiherr (Baron) von Hardenberg (May 2, 1772 - March 25, 1801), an author and philosopher of early German Romanticism."

"Novalis was the pseudonym of Georg Philipp Friedrich Freiherr (Baron) von Hardenberg (1772-1801), called Friedrich von Hardenberg. The death in 1797 of his young fiancé, Sophie von Kühn, led him to write Hymnen an die Nacht (Hymns to the Night), a set of six prose and verse lyrics first published in 1800 in Athenaeum, a literary magazine edited by August Wilhelm Schlegel and his brother Friedrich Schlegel. Seven months after the publication of Hymns to the Night, Novalis died of tuberculosis, the same disease that had claimed his fiancé.

"Answering the Question: What is Enlightenment?" (German: "Beantwortung der Frage: Was ist Aufklärung?") is the title of a 1784 essay by the philosopher Immanuel Kant. In the December 1784 publication of the Berlinische Monatsschrift (Berlin Monthly), edited by Friedrich Gedike and Johann Erich Biester, Kant replied to the question posed a year earlier by the Reverend Johann Friedrich Zöllner, who was also an official in the Prussian government. Zöllner's question was addressed to a broad intellectual public, in reply to Biester's essay entitled: "Proposal, not to engage the clergy any longer when marriages are conducted" (April 1783) and a number of leading intellectuals replied with essays, of which Kant's is the most famous and has had the most impact. Kant's opening paragraph of the essay is a much-cited definition of a lack of Enlightenment as people's inability to think for themselves due not to their lack of intellect, but lack of courage.

"Arthur Schopenhauer (February 22, 1788 – September 21, 1860) was a German philosopher. He is most famous for his work The World as Will and Idea.

The book of history is subject to numerous interpretations. Two wholly opposed points of view are evident. One group sees in all earthly things nothing but a wretched cycle. In the life of peoples like in that of individuals, and in organic nature in general, they see growth, flowering, decay, and death; spring, summer, autumn, and winter. Their's is the slogan: "There is nothing new under the sun" even this slogan being no longer new since some two thousand years ago the king of the Orient had murmured it.