Thomas Hobbes,
The Elements of Law — Part I, Chapter 19
“ For nothing but fear can justify the taking away of another's life. And because fear can hardly be made manifest, but by some action dishonourable, that betrayeth the conscience of one's own weakness; all men in whom the passion of courage or magnanimity have been predominated, have abstained from cruelty; insomuch that though there be in war no law, the breach whereof is injury, yet there are those laws, the breach whereof is dishonour. ”
