In a general view, there are few conquests that repay the charge of making them, and mankind are pretty well convinced that it can never be worth their while to go to war for profit's sake. If they are made war upon, their country invaded, or their existence at stake, it is their duty to defend and preserve themselves, but in every other light, and from every other cause, is war inglorious and detestable.

The Works of Thomas Paine (ed. 1797)