§. 18. This makes it lawful for a man to kill a thief who has not in the least
hurt him, nor declared any design upon his life, any farther than by the use of
force, so to get him in his power as to take away his money, or what he
pleases, from him; because using force, where he has no right to get me into
his power, let his pretence be what it will, I have no reason to suppose that
he who would take away my liberty would not, when he had me in his power, take
away everything else. And, therefore, it is lawful for me to treat him as one
who has put himself into a state of war with me — i.e., kill him if I can;
for to that hazard does he justly expose himself whoever introduces a state of
war, and is aggressor in it.