We do nothing more than classify and arrange these, in order to better understand them.

It is so little opposed to practice, that it is in fact only _practice explained_.

We look upon the actions of men as prompted by the instinct of self-preservation and of progress.

What they do freely, willingly,--this is what we call _Political Economy_, or economy of society.

We must repeat constantly that each man is _practically_ an excellent political economist, producing or exchanging, as his advantage dictates.