I recoil with horror at the ferociousness of man. Will nations never devise a more rational umpire of differences than force? Are there no means of coercing injustice more gratifying to our nature than a waste of the blood of thousands and of the labor of millions of our fellow creatures?

Speaking one day to Monsieur de Buffon, on the present ardor of chemical inquiry, he affected to consider chemistry but as cookery, and to place the toils of the laboratory on the footing with those of the kitchen. I think it, on the contrary, among the most useful of sciences, and big with future discoveries for the utility and safety of the human race.

I consider ethics, as well as religion, as supplements to law in the government of man.

Do not be too severe upon the errors of the people, but reclaim them by enlightening them.

It [appears] that however certain forms of government are better calculated than others to protect individuals in the free exercise of their natural rights, and are at the same time themselves better guarded against degeneracy, yet experience [has] shown that, even under the best forms, those entrusted with power have, in time and by slow operations, perverted it into tyranny.

If the obstacles of bigotry and priestcraft can be surmounted, we may hope that common sense will suffice to do everything else.

You have never by a word or a deed given me one moment's uneasiness; on the contrary I have felt perpetual gratitude to heaven forhaving given me, in you, a source of so much pure and unmixed happiness.