Full Idea
Grotius said that all men would agree that everyone has a fundamental right to preserve themselves, and that wanton or unnecessary injury to another person is unjustifiable.
Gist of Idea
Everyone has a right of self-preservation, and harming others is usually unjustifiable
Source
report of Hugo Grotius (On the Law of War and Peace [1625]) by Richard Tuck - Hobbes Ch.1
Book Reference
Tuck,Richard: 'Hobbes: a very short introduction' [OUP 2002], p.26
A Reaction
Who cares if it is 'justifiable'? Do I have to 'justify' killing a mosquito if it lands on my arm? Grotius is taking a step beyond saying that people should defend themselves, to say that they have a 'right' to - the only truly basic right.