The greatest objection is, that of the practice; when men ask, where, and when, such power has by subjects been acknowledged. But one may ask them again, when, or where has there been a kingdom long free from sedition and civil war. In those nations, whose commonwealths have been long-lived, and not been destroyed but by foreign war, the subjects never did dispute of the sovereign power. But howsoever, an argument from the practice of men, that have not sifted to the bottom, and with exact reason weighed the causes, and nature of commonwealths, and suffer daily those miseries, that proceed from the ignorance thereof, is invalid. For though in all places of the world, men should lay the foundation of their houses on the sand, it could not thence be inferred, that so it ought to be. The skill of making, and maintaining commonwealths, consisteth in certain rules, as doth arithmetic and geometry; not, as tennis-play, on practice only: which rules, neither poor men have the leisure, nor men that have had the leisure, have hitherto had the curiosity, or the method to find out. ------- CHAPTER XXI. OF THE LIBERTY OF SUBJECTS. [Sidenote: Liberty what.] LIBERTY, or FREEDOM, signifieth, properly, the absence of opposition; by opposition, I mean external impediments of motion; and may be applied no less to irrational, and inanimate creatures, than to rational. For whatsoever is so tied, or environed, as it cannot move but within a certain space, which space is determined by the opposition of some external body, we say it hath not liberty to go further. And so of all living creatures, whilst they are imprisoned, or restrained, with walls, or chains; and of the water whilst it is kept in by banks, or vessels, that otherwise would spread itself into a larger space, we use to say, they are not at liberty, to move in such manner, as without those external impediments they would. But when the impediment of motion, is in the constitution of the thing itself, we use not to say; it wants the liberty; but the power to move; as when a stone lieth still, or a man is fastened to his bed by sickness. [Sidenote: What it is to be free.]