His thought reduced all Kantian cognitive forms to time, space and mechanical causality, and considered things-in-themselves quite knowable.
His final work was rejected three times before manuscript was accepted, it contained essays like "Transcendent Speculation on the Apparent Premeditation in Personal Fate," "Essay on Ghost Seeing and its Related Aspects," and "Aphorisms on Practical Wisdom." Garnering much more attention than previous books like On the Fourfold Root and The Two Main Problems of Ethics, the two volume Parerga and Paralipomena brought recognition to this man who helped Goethe pen his "theory of colors." His thought reduced all Kantian cognitive forms to time, space and mechanical causality, and considered things-in-themselves quite knowable. Unfortunately his lectures at the University were poorly attended, as people preferred those of his rival Hegel.  FTP, name this man whose pessimistic ideas were strongly influenced by the Upanishads and Buddhism, the author of 1819's The World As Will and Idea.
His final work was rejected three times before manuscript was accepted, it contained essays like "Transcendent Speculation on the Apparent Premeditation in Personal Fate," "Essay on Ghost Seeing and its Related Aspects," and "Aphorisms on Practical Wisdom."
Arthur Schopenhauer