Hugo Grotius,
The Rights of War and Peace
“ For peace is made with a view to the security of every individual subject: as the state in making peace acts for the whole, and for all its parts.Indeed even if new grounds of war should arise, every one may, during the continuance of peace, defend himself and his property. For it is a natural right to repel force by force: a right which it cannot easily be supposed that those, who are upon a footing of equality have ever renounced. ”
