Further, the law enjoins that no private man shall be allowed to possess gold and silver, but only coin for daily use, which is almost necessary in dealing with artisans, and for payment of hirelings, whether slaves or immigrants, by all those persons who require the use of them.  Wherefore our citizens, as we say, should have a coin passing current among themselves, but not accepted among the rest of mankind; with a view, however, to expeditions and journeys to other lands,—­for embassies, or for any other occasion which may arise of sending out a herald, the state must also possess a common Hellenic currency.  If a private person is ever obliged to go abroad, let him have the consent of the magistrates and go; and if when he returns he has any foreign money remaining, let him give the surplus back to the treasury, and receive a corresponding sum in the local currency.  And if he is discovered to appropriate it, let it be confiscated, and let him who knows and does not inform be subject to curse and dishonour equally him who brought the money, and also to a fine not less in amount than the foreign money which has been brought back.  In marrying and giving in marriage, no one shall give or receive any dowry at all; and no one shall deposit money with another whom he does not trust as a friend, nor shall he lend money upon interest; and the borrower should be under no obligation to repay either capital or interest.  That these principles are best, any one may see who compares them with the first principle and intention of a state.  The intention, as we affirm, of a reasonable statesman, is not what the many declare to be the object of a good legislator, namely, that the state for the true interests of which he is advising should be as great and as rich as possible, and should possess gold and silver, and have the greatest empire by sea and land;—­this they imagine to be the real object of legislation, at the same time adding, inconsistently, that the true legislator desires to have the city the best and happiest possible.  But they do not see that some of these things are possible, and some of them are impossible; and he who orders the state will desire what is possible, and will not indulge in vain wishes or attempts to accomplish that which is impossible.  The citizen must indeed be happy and good, and the legislator will seek to make him so; but very rich and very good at the same time he cannot be, not, at least, in the sense in which the many speak of riches.  For they mean by ‘the rich’ the few who have the most valuable possessions, although the owner of them may quite well be a rogue.  And if this is true, I can never assent to the doctrine that the rich man will be happy—­he must be good as well as rich.  And good in a high degree, and rich in a high degree at the same time, he cannot be.  Some one will ask, why not?  And we shall answer—­Because acquisitions which come from sources which are just and unjust indifferently, are more than double those which come from just sources