Ethics Part 2

Ethics Part 2 by Benedictus de Spinoza

The second part focuses on the human mind and body. Spinoza attacks several Cartesian positions: (1) that the mind and body are distinct substances that can affect one another; (2) that we know our minds better than we know our bodies; (3) that our senses may be trusted; (4) that despite being created by God we can make mistakes, namely, when we affirm, of our own free will, an idea that is not clear and distinct. Spinoza denies each of Descartes's points. Regarding (1), Spinoza argues that the mind and the body are a single thing that is being thought of in two different ways. The whole of nature can be fully described in terms of thoughts or in terms of bodies. However, we cannot mix these two ways of describing things, as Descartes does, and say that the mind affects the body or vice versa. Moreover, the mind's self-knowledge is not fundamental: it cannot know its own thoughts better than it knows the ways in which its body is acted upon by other bodies. Further, there is no difference between contemplating an idea and thinking that it is true, and there is no freedom of the will at all. Sensory perception, which Spinoza calls "knowledge of the first kind", is entirely inaccurate, since it reflects how our own bodies work more than how things really are. We can also have a kind of accurate knowledge called "knowledge of the second kind", or "reason". This encompasses knowledge of the features common to all things, and includes principles of physics and geometry. We can also have "knowledge of the third kind", or "intuitive knowledge". This is a sort of knowledge that, somehow, relates particular things to the nature of God.