In the "Ethics",Spinoza discusses his beliefs about what he considers to be the three kinds of knowledge that come with perceptions. The first kind of knowledge he writes about is the knowledge of experiences. More precisely, this first type of knowledge can be known as the knowledge of things that could be "mutilated, confused, and without order."Spinoza’s second knowledge involves reasoning plus emotions.Spinoza defines the third and final knowledge as the knowledge of God, which requires rationality and reason of the mind. In more detail, Spinoza uses this type of knowledge to join together the essence of God with the individual essence.

Baruch Spinoza (24 November 1632 – 21 February 1677, later Benedict de Spinoza) was a Dutch philosopher of Sephardi/Portuguese origin.By laying the groundwork for the 18th-century Enlightenment and modern biblical criticism,including modern conceptions of the self and the universe,he came to be considered one of the great rationalists of 17th-century philosophy.Along with René Descartes, Spinoza was a leading philosophical figure of the Dutch Golden Age.