The animal merely makes a bed, which he warms with his body in a sheltered place; but man, having discovered fire, boxes up some air in a spacious apartment, and warms that, instead of robbing himself, makes that his bed, in which he can move about divested of more cumbrous clothing, maintain a kind of summer in the midst of winter, and by means of windows even admit the light and with a lamp lengthen out the day.

Mathematics should be mixed not only with physics but with ethics.

Any sincere thought is irresistible.

I would not have every man nor every part of a man cultivated, any more than I would have every acre of earth cultivated: part will be tillage, but the greater part will be meadow and forest, not only serving an immediate use, but preparing a mould against a distant future, by the annual decay of the vegetation which it supports.

Politics is the gizzard of society, full of grit and gravel, and the two political parties are its opposite halves - sometimes split into quarters - which grind on each other. Not only individuals but states have thus a confirmed dyspepsia.

If it is surely the means to the highest end we know, can any work be humble or disgusting? Will it not rather be elevating as a ladder, the means by which we are translated?

Few, if any, creatures are equally active all night.