You have not been mistaken in supposing my views and feeling to be in favor of the abolition of war. Of my dispos[i]tion to maintain peace until its condition shall be made less tolerable than that of war itself, the world has had proofs, and more, perhaps, than it has approved. I hope it is practicable, by improving the mind and morals of society, to lessen the dispos[i]tion to war; but of its abolition I despair.
The Jefferson Papers [1770-1826 (ed. 1900)