The destiny of America is to carry the gospel of Jesus Christ to all men everywhere.

I must study politics and war that my sons may have liberty to study mathematics and philosophy.

Great is the guilt of an unnecessary war.

I must study Politicks and War that my sons may have liberty to study Mathematicks and Philosophy. My sons ought to study Mathematicks and Philosophy, Geography, natural History, Naval Architecture, navigation, Commerce and Agriculture, in order to give their Children a right to study Painting, Poetry, Musick, Architecture, Statuary, Tapestry and Porcelaine. (12 May 1780)

Genius is sorrow's child.

The Europeans are all deeply tainted with prejudices, both ecclesiastical and temporal, which they can never get rid of. They are all infected with episcopal and presbyterian creeds, and confessions of faith. They all believe that great Principle which has produced this boundless universe, Newton's universe and Herschell's universe, came down to this little ball, to be spit upon by Jews. And until this awful blasphemy is got rid of, there never will be any liberal science in the world.

The right of a nation to kill a tyrant in case of necessity can no more be doubted than to hang a robber, or kill a flea.