It is to labour... and to labour only, that man owes every thing possessed of exchangeable value. Labour is the talisman that has raised him from the condition of the savage — that has changed the desert and the forest into cultivated fields... Labour tho that has covered the earth with cities and the ocean with ships — of wealth that has given us plenty, comfort, and elegance, instead of want, misery, and barbarism.

p. 55-56 ; - The principles of political economy, 1825