Summa Theologica I-II, q. 105: Of the Reason for the Judicial Precepts
But with regard to possessions, it is a very good thing, says the Philosopher (Polit. ii, 2) that the things possessed should be distinct, and the use thereof should be partly common, and partly granted to others by the will of the possessors. These three points were provided for by the Law. Because, in the first place, the possessions themselves were divided among individuals: for it is written (Num. 33:53,54): "I have given you" the land "for a possession: and you shall divide it among you by lot." And since many states have been ruined through want of regulations in the matter of possessions, as the Philosopher observes (Polit. ii, 6); therefore the Law provided a threefold remedy against the irregularity of possessions. The first was that they should be divided equally, wherefore it is written (Num. 33:54): "To the more you shall give a larger part, and to the fewer, a lesser." A second remedy was that possessions could not be alienated for ever, but after a certain lapse of time should return to their former owner, so as to avoid confusion of possessions (cf. ad 3). The third remedy aimed at the removal of this confusion, and provided that the dead should be succeeded by their next of kin: in the first place, the son; secondly, the daughter; thirdly, the brother; fourthly, the father's brother; fifthly, any other next of kin. Furthermore, in order to preserve the distinction of property, the Law enacted that heiresses should marry within their own tribe, as recorded in Num. 36:6.
Secondly, the Law commanded that, in some respects, the use of things should belong to all in common. Firstly, as regards the care of them; for it was prescribed (Dt. 22:1-4): "Thou shalt not pass by, if thou seest thy brother's ox or his sheep go astray; but thou shalt bring them back to thy brother," and in like manner as to other things. Secondly, as regards fruits. For all alike were allowed on entering a friend's vineyard to eat of the fruit, but not to take any away. And, specially, with respect to the poor, it was prescribed that the forgotten sheaves, and the bunches of grapes and fruit, should be left behind for them (Lev. 19:9; Dt. 24:19). Moreover, whatever grew in the seventh year was common property, as stated in Ex. 23:11 and Lev. 25:4.
Thirdly, the law recognized the transference of goods by the owner. There was a purely gratuitous transfer: thus it is written (Dt. 14:28,29): "The third day thou shalt separate another tithe. . . and the Levite. . . and the stranger, and the fatherless, and the widow. . . shall come and shall eat and be filled." And there was a transfer for a consideration, for instance, by selling and buying, by letting out and hiring, by loan and also by deposit, concerning all of which we find that the Law made ample provision. Consequently it is clear that the Old Law provided sufficiently concerning the mutual relations of one man with another.
Reply to Objection 1As the Apostle says (Rom. 13:8), "he that loveth his neighbor hath fulfilled the Law": because, to wit, all the precepts of the Law, chiefly those concerning our neighbor, seem to aim at the end that men should love one another. Now it is an effect of love that men give their own goods to others: because, as stated in 1 Jn. 3:17: "He that. . . shall see his brother in need, and shall shut up his bowels from him: how doth the charity of God abide in him?" Hence the purpose of the Law was to accustom men to give of their own to others readily: thus the Apostle (1 Tim. 6:18) commands the rich "to give easily and to communicate to others." Now a man does not give easily to others if he will not suffer another man to take some little thing from him without any great injury to him. And so the Law laid down that it should be lawful for a man, on entering his neighbor's vineyard, to eat of the fruit there: but not to carry any away, lest this should lead to the infliction of a grievous harm, and cause a disturbance of the peace: for among well-behaved people, the taking of a little does not disturb the peace; in fact, it rather strengthens friendship and accustoms men to give things to one another.
Reply to Objection 2The Law did not prescribe that women should succeed to their father's estate except in default of male issue: failing which it was necessary that succession should be granted to the female line in order to comfort the father, who would have been sad to think that his estate would pass to strangers. Nevertheless the Law observed due caution in the matter, by providing that those women who succeeded to their father's estate, should marry within their own tribe, in order to avoid confusion of tribal possessions, as stated in Num. 36:7,8.
Reply to Objection 3As the Philosopher says (Polit. ii, 4), the regulation of possessions conduces much to the preservation of a state or nation. Consequently, as he himself observes, it was forbidden by the law in some of the heathen states, "that anyone should sell his possessions, except to avoid a manifest loss." For if possessions were to be sold indiscriminately, they might happen to come into the hands of a few: so that it might become necessary for a state or country to become void of inhabitants. Hence the Old Law, in order to remove this danger, ordered things in such a way that while provision was made for men's needs, by allowing the sale of possessions to avail for a certain period, at the same time the said danger was removed, by prescribing the return of those possessions after that period had elapsed. The reason for this law was to prevent confusion of possessions, and to ensure the continuance of a definite distinction among the tribes.