As, before putting up a large building, the architect surveys and sounds the site to see if it will bear the weight, the wise legislator does not begin by laying down laws good in themselves, but by investigating the fitness of the people, for which they are destined, to receive them. Plato refused to legislate for the Arcadians and the Cyrenæans, because he knew that both peoples were rich and could not put up with equality; and good laws and bad men were found together in Crete, because Minos had inflicted discipline on a people already burdened with vice. A thousand nations have achieved earthly greatness, that could never have endured good laws; even such as could have endured them could have done so only for a very brief period of their long history. Most peoples, like most men, are docile only in youth; as they grow old they become incorrigible. When once customs have become established and prejudices inveterate, it is dangerous and useless to attempt their reformation; the people, like the foolish and cowardly patients who rave at sight of the doctor, can no longer bear that any one should lay hands on its faults to remedy them. There are indeed times in the history of States when, just as some kinds of illness turn men's heads and make them forget the past, periods of violence and revolutions do to peoples what these crises do to individuals: horror of the past takes the place of forgetfulness, and the State, set on fire by civil wars, is born again, so to speak, from its ashes, and takes on anew, fresh from the jaws of death, the vigour of youth. Such were Sparta at the time of Lycurgus, Rome after the Tarquins, and, in modern times, Holland and Switzerland after the expulsion of the tyrants. But such events are rare; they are exceptions, the cause of which is always to be found in the particular constitution of the State concerned. They cannot even happen twice to the same people, for it can make itself free as long as it remains barbarous, but not when the civic impulse has lost its vigour. Then disturbances may destroy it, but revolutions cannot mend it: it needs a master, and not a liberator. Free peoples, be mindful of maxim; "Liberty may be gained, but can never be recovered."