There are but two ways of paying debt: Increase of industry in raising income, increase of thrift in laying out.

Silence is as deep as eternity, speech a shallow as time.

Dishonesty is the raw material not of quacks only, but also in great part dupes.

The steam-engine I call fire-demon and great; but it is nothing to the invention of fire.

When we can drain the Ocean into mill-ponds, and bottle up the Force of Gravity, to be sold by retail, in gas jars; then may we hope to comprehend the infinitudes of man's soul under formulas of Profit and Loss; and rule over this too, as over a patent engine, by checks, and valves, and balances.

The tragedy of life is not so much what men suffer, but rather what they miss.

The eye of the intellect "sees in all objects what it brought with it the means of seeing."