Machinery and labor-saving devices are only valuable as they serve to reduce the cost of manufacture.

The story of a poor man's life is written on his body, in a sharp pen.

To thrive in a changing world, you must be willing to adapt and innovate.

Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

The past is a kind of future that has already happened.