Philosophy of the Unconscious: Speculative Results According to the Induction Method of the Physical Sciences is an 1869 book by the philosopher Eduard von Hartmann. The culmination of the speculations and findings of German romantic philosophy in the first two-thirds of the 19th century, Philosophy of the Unconscious became famous. By 1882, it had appeared in nine editions. A three volume English translation appeared in 1884. The English translation is more than 1100 pages long. The work influenced Sigmund Freud's and Carl Jung's theories of the unconscious.

On the Advantage and Disadvantage of History for Life is a work by Friedrich Nietzsche published in 1874 and the second of his four Untimely Meditations. The treatise is considered an important work from Nietzsche's early creative period. In it, he criticizes his academic contemporaries who, in his opinion, either overestimate or misjudge the importance of history. This work also anticipates Nietzsche's later themes and has received comparatively great attention.