Ethics by Benedict de Spinoza demonstrated in Geometrical Order shows us the reality behind this enigmatic figure. First published by his friends after his premature death at the age of forty-four, the Ethics uses the methods of Euclid to describe a single entity, properly called both 'God' and 'Nature', of which mind and matter are two manifestations. From this follow, in ways that are strikingly modern, the identity of mind and body, the necessary causation of events and actions, and the illusory nature of free will.