Spinoza's ethics proceed from a premise similar to that of Hobbes—that men call "good" whatever gives them pleasure—but they reach very different conclusions. Human beings, indeed all of Nature, share a common drive for self-preservation, the conatus sese conservandi. By this drive all individuals seek to maintain the power of their being, and in this sense virtue and power are one. But in Spinoza's system power is discovered to be a knowledge of necessity. Powerful, or virtuous, persons act because they understand why they must; others act because they cannot help themselves.
To be free is to be guided by the law of one's own nature (which in Spinoza's rational universe is never at variance with the law of another nature); bondage consists in being moved by causes of which we are unaware because our ideas are confused. Another important feature of Spinoza's ethical system is his view of the intellect as active. He rejects the distinction between reason and will that assumes that ideas can be passively entertained. All thinking is action, and all action has its accompaniment in thought. What accounts for action is not an agency (the will) beyond the intellect, but ideas. Ideas are active and move us to act; an absence of action may be accounted an absence of insight: knowledge, virtue, and power are one.
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