The principle of human law is mutable, therefore the law itself can be changed. The antecedent is agreed, since human will is the cause of the law, but human will is doubtful and infirm. 2. This same thing is proven by an argument from similarity, since what happens in the arts can also happen in laws, in the arts change is often necessary (as in medicine and gymnastics), therefore it is sometimes permissible to change laws. The minor is proven in the text by the example of very foolish laws about wearing swords and purchasing wives, which were bequeathed the Greeks from ancient times by their ancestors.