How does Locke differentiate between the laws of nature and the laws of man?

Locke believed that reason is the law of nature, for in a state of liberty where there are no limitations, a man must understand that he should respect all other men’s lives, health, liberty, and possessions. (but we do not do that) All men should seek to preserve the rest of mankind unless they have committed an offense against the life, health, liberty, or possessions of another (we seem to believe man does this all the time but we are really just crazy people now). In a state of nature, there is no government or superior force to carry out the laws and every man may bring punishment to that of whom committed the crime.