Tractatus de Intellectus Emendatione (1677) or On The Improvement Of The Understanding, is a seventeenth-century unfinished work of philosophy by the 17th century philosopher Baruch Spinoza. The Tractatus was first published in 1677, the year of Spinoza's death, by some of his closest friends, along with other works including the Ethica and the Tractatus Politicus.[1] The Tractatus is an attempt to formulate a philosophical method that would allow the mind to form the clear and distinct ideas that are necessary for its perfection. It contains, in addition, reflection upon the various kinds of knowledge, an extended treatment of definition, and a lengthy analysis of the nature and causes of doubt. The characteristic of the work is the discussion of different form of perception at Chapter IV and illustration of the best one in relation with the experience and intelligence at the next Chapter. He also addresses the issues of memory and forgetting.

On The Improvement Of The Understanding, is a seventeenth-century unfinished work of philosophy by the 17th century philosopher Baruch Spinoza.It was first published in 1677, the year of Spinoza's death, by some of his closest friends, along with other works including the Ethica and the Tractatus Politicus.The Tractatus is an attempt to formulate a philosophical method that would allow the mind to form the clear and distinct ideas that are necessary for its perfection. It contains, in addition, reflection upon the various kinds of knowledge, an extended treatment of definition, and a lengthy analysis of the nature and causes of doubt. The characteristic of the work is the discussion of different form of perception at Chapter IV and illustration of the best one in relation with the experience and intelligence at the next Chapter. He also addresses the issues of memory and forgetting.

Baruch Spinoza (/bəˈruːk spɪˈnoʊzə/;born Benedito de Espinosa; 24 November 1632 – 21 February 1677, later Benedict de Spinoza) was a Dutch philosopher of Sephardi Portuguese origin.The breadth and importance of Spinoza's work was not fully realized until many years after his death. By laying the groundwork for the 18th-century Enlightenment and modern biblical criticism,including modern conceptions of the self and, arguably, the universe, he came to be considered one of the great rationalists of 17th-century philosophy. His magnum opus, the posthumous Ethics, in which he opposed Descartes' mind–body dualism, has earned him recognition as one of Western philosophy's most important thinkers. In the Ethics, "Spinoza wrote the last indisputable Latin masterpiece, and one in which the refined conceptions of medieval philosophy are finally turned against themselves and destroyed entirely."Hegel said, "You are either a Spinozist or not a philosopher at all." His philosophical accomplishments and moral character prompted 20th-century philosopher Gilles Deleuze to name him "the 'prince' of philosophers".