The World as Will and Representation, sometimes translated as The World as Will and Idea, is the central work of the German philosopher Arthur Schopenhauer. The first edition was published in late 1818, with the date 1819 on the title-page. A second, two-volume edition appeared in 1844: volume one was an edited version of the 1818 edition, while volume two consisted of commentary on the ideas expounded in volume one. A third expanded edition was published in 1859, the year prior to Schopenhauer's death. In 1948, an abridged version was edited by Thomas Mann.
Schopenhauer in 1815, second of the critical five years of the initial composition of Die Welt als Wille und Vorstellung
The phrase "Tat Tvam Asi" ('thou art that'), one of the Mahāvākyas of the Upanishads, displayed on an Indian temple. Schopenhauer uses this Sanskrit phrase to express a foundational tenet of his ethics: 'the will is the in-itself of every appearance, and as such is itself free from the form of appearance, and thus from all multiplicity' (Book IV, §66).
On the Fourfold Root of the Principle of Sufficient Reason is an elaboration on the classical principle of sufficient reason, written by German philosopher Arthur Schopenhauer as his doctoral dissertation in 1813. The principle of sufficient reason is a powerful and controversial philosophical principle stipulating that everything must have a reason or cause. Schopenhauer revised and re-published it in 1847. The work articulated the centerpiece of many of Schopenhauer's arguments, and throughout his later works he consistently refers his readers to it as the necessary beginning point for a full understanding of his further writings.
