According to Spinoza, God is Nature and Nature is God. First published by his friends after his death, 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. Spinoza regarded ethics as a rational system corresponding to the rational nature of the universe and employed a deductive method derived from Euclidean geometry to show that the validity of ethical ideas can be demonstrated by a mathematical style argument. His conclusion: to be guided by reason is to live freely, motivated by love and goodwill rather than fear or hatred. Ethics is undoubtedly Spinoza's greatest work - an elegant, fully cohesive cosmology derived from first principles, providing a coherent picture of reality, and a guide to the meaning of an ethical life, it defines in turn the nature of God, the mind, the emotions, human bondage to the emotions, and the power of understanding - moving from a consideration of the eternal, to speculate upon humanity's place in the natural order, the nature of freedom and the path to attainable happiness. A powerful work of elegant simplicity, the Ethics is a brilliantly insightful consideration of the possibility of redemption through intense thought and philosophical reflection.