"The natural effort of every individual to better his own condition is so powerful that it is alone, and without any assistance, not only capable of carrying on the society to wealth and prosperity, but is continually assending."
"The rise or fall of profits is the thermometer by which the rise or fall of wages is to be measured."
"Labor, like all other things which are purchased and sold, and which may be increased or diminished in quantity, has its natural and its market price."
"Political economy you think is an enquiry into the nature and causes of the wealth of nations. It is no such thing."
"Rent is that portion of the produce of the earth which is paid to the landlord for the use of the original and indestructible powers of the soil."