Stoicism is a religious philosophy that concentrates more on how to live your life than on a metaphysical system. However, it doesa metaphysical system, just not one as deeply developed as, say, Plato's.In the Stoic view, the Greek concept of Logos (divine Reason) is identical with what we think of as the laws of nature. We can puzzle out these laws through the use of our own reason; therefore Reason must be the creator of (or, in the Stoic view, identical with) natural laws.Because God was identified with the course of nature, the "good life" was one lived in accordance with nature. You didn't try to accumulate more than you needed for a healthy life, nor did you try to prolong your life beyond its natural limits. In fact, good and evil could never happen to you, as all externals were considered valueless. The only good or evil thing was how the Stoic behaved, and how s/he accepted life.What that means is that, if someone injures or insults me, that's neither good nor evil, because it's external to me. What would be evil is if I fought back through injury or insult in turn--but not necessarily because it would be wrong to injure or insult another person. I would be doing wrong by letting my emotions override my reason; that's the true evil in the human world.Reason was the driving force behind the Stoic understanding of right and wrong. The Stoic determined right and wrong based on reality (i.e., nature), but also had to filter ideas about nature through reason, rather than emotion. Thus the Stoic would find that, since death is natural, death is not bad--but being overcome with sorrow or fear is. The passions (strong emotions that could cloud judgment, such as anger or lust) were not to be trusted; there were appropriate emotions, such as joy, doubt, or hope. The difference between the two (passions vs. appropriate feelings) is that the passions are not reasonable, whereas appropriate emotion comes out of reasoned thought.Spinoza similarly identified the laws of nature with divine necessity. Coming out of a Jewish background, he saw the Biblical accounts of God's relationship with Israel as the natural actions of a divine will in connection with a people who understood God in a specific way.Spinoza, like the Stoics, was a determinist. He may have been an even harder determinist than the original Stoics, since they believed that you were free in your own actions (but you could not affect the actions of others). Spinoza believed that happiness only came to the person who understood that his/her actions were determined by other factors. The greatest good was in understanding God/nature, understanding that events did not happen in a vacuum or by pure chance, and that even your own feelings/thoughts were affected (limited) by things out of human control.So Spinoza's concept of the "good life" was very similar to the Stoic one, though with some differences.First, the Stoics allowed for a limited free will--but only those who were truly wise (in the Stoic sense of the morality of reason) had free will. Freedom only came with the mastery of the passions and the proper use of reason. Even then, the only thing you had control of was your own physical and emotional actions and reactions in the world.Spinoza, on the other hand, declared that only God had free will. Only God was unlimited by externals; everything a human does is limited by the things and events around him/her, so the human can never have true free will. Because God is the only thing which exists, God cannot be affected by something external; therefore, God's actions are truly free.Both the Stoics and Spinoza did have very similar concepts of the path to happiness. They both believed that the acceptance of life and the realization of the value-neutrality of externals led to inner peace. For both, this acceptance depended on true knowledge of nature, natural law, and the place we have in it.All of this is quite similar to the Buddhist doctrine of nonattachment. Unlike Buddhism, though, neither Spinoza nor the Stoics acknowledged much in the way of after-death consequences (such as transmigration of souls) of behavior in this life.