The first is the law of nations, which applies to their mutual intercourse ie international law. The second is political law. This applies to the relations between government and the governed. This is constitutional, public, and administrative law. The third type is civil law.
Civil law regulates the relations of citizens among themselves.
These laws are created from reason. Montisquieu states that law in general is the human reason. Montisuqieu maintains that society is directed by laws and liberty comes when people follow the laws. Even in a moderate government liberty is hard to find because man abuses power. That is why he thinks that power should be checked with equal power.