# great ideas angel animal aristocracy art astronomy beauty being cause chance change citizen constitution contingency convention cosmology courage custom death definition democracy desire despotism dialectic duty education element emotion equality eternity evil evolution experience family fate form god good government habit happiness history honor hypothesis idea imagination immortality induction infinity judgment justice knowledge labor language law liberty life logic love man many mathematics matter mechanics medicine memory metaphysics mind monarchy nature necessity oligarchy one opinion opposition other pain particular peace philosophy physics pleasure poetry principle progress prophecy prudence punishment quality quantity reasoning relation religion revolution rhetoric same science sense sign sin slavery soul space state symbol temperance theology time truth tyranny universal vice virtue war wealth will wisdom world