But in the state of nature, while absolutely free to do whatever they wish, human beings live in constant fear. For other human beings also have the right to do whatever they wish and to whomever they wish. Humans trade freedom, the right to do whatever they wish, for security. Human beings by nature tend to draw up artificial agreements to unnaturally restrict their desires. They make laws.
Laws are external restrictions on natural freedom.
Thus, human beings cannot be both safe and happy in this life. But civil society does not eliminate fear. It replaces fear with fear. Fear of force in man's natural state gives way to fear of force in civil society. It is fear of punishment, not natural inclination to act morally, that keeps individuals in check.