Full Idea
The relations of equity precede the positive laws that establish them. It is right to conform to laws in a society; intelligent beings should be grateful for benefits; we remain dependent on those who create us; an injury merits the same in return.
Gist of Idea
Prior to positive laws there is natural equity, of obedience, gratitude, dependence and merit
Source
Baron de Montesquieu (The Spirit of the Laws (rev. 1757) [1748], 01.01)
A Reaction
[the examples are compressed] A nice statement of the idea of natural law. It doesn't follow that because an injury merits retaliation, that it should be implemented (just that no one can complain if it happens).
Book Reference
Montesquieu,Baron de: 'Selected Political Writings', ed/tr. Richter,Melvin [Hackett 1990], p.110