You form a theory as well as ourselves; but between yours and ours there is this difference: our theory consists merely in observing universal facts, universal sentiments, universal calculations and proceedings, and further, in classifying them and arranging them, in order to understand them better.

It is so little opposed to practice, that it is nothing but _practice explained_.

We observe the actions of men moved by the instinct of preservation and of progress; and what they do freely, voluntarily, is precisely what we call _political economy_, or the economy of society.

We go on repeating with out cessation: "Every man is _practically_ an excellent economist, producing or exchanging, according as it is most advantageous to him to exchange or to produce.

Each one, through experience, is educated to science; or rather, science is only that same experience scrupulously observed and methodically set forth." As for you, you form a theory, in the unfavorable sense of the word.
You imagine, you invent--proceedings which are not sanctioned by the practice of any living man under the vault of heaven--and then you call to your assistance constraint and prohibition.