Reply Obj. 2: A kingdom is the best form of government of the people, so long as it is not corrupt. But since the power granted to a king is so great, it easily degenerates into tyranny, unless he to whom this power is given be a very virtuous man: for it is only the virtuous man that conducts himself well in the midst of prosperity, as the Philosopher observes (Ethic. iv, 3). Now perfect virtue is to be found in few: and especially were the Jews inclined to cruelty and avarice, which vices above all turn men into tyrants. Hence from the very first the Lord did not set up the kingly authority with full power, but gave them judges and governors to rule them. But afterwards when the people asked Him to do so, being indignant with them, so to speak, He granted them a king, as is clear from His words to Samuel (1 Kings 8:7): "They have not rejected thee, but Me, that I should not reign over them."
Nevertheless, as regards the appointment of a king, He did establish the manner of election from the very beginning (Deut. 17:14, seqq.): and then He determined two points: first, that in choosing a king they should wait for the Lord's decision; and that they should not make a man of another nation king, because such kings are wont to take little interest in the people they are set over, and consequently to have no care for their welfare: secondly, He prescribed how the king after his appointment should behave, in regard to himself; namely, that he should not accumulate chariots and horses, nor wives, nor immense wealth: because through craving for such things princes become tyrants and forsake justice. He also appointed the manner in which they were to conduct themselves towards God: namely, that they should continually read and ponder on God's Law, and should ever fear and obey God. Moreover, He decided how they should behave towards their subjects: namely, that they should not proudly despise them, or ill-treat them, and that they should not depart from the paths of justice.
Reply Obj. 3: The division of the kingdom, and a number of kings, was rather a punishment inflicted on that people for their many dissensions, specially against the just rule of David, than a benefit conferred on them for their profit. Hence it is written (Osee 13:11): "I will give thee a king in My wrath"; and (Osee 8:4): "They have reigned, but not by Me: they have been princes, and I knew not."
Reply Obj. 4: The priestly office was bequeathed by succession from father to son: and this, in order that it might be held in greater respect, if not any man from the people could become a priest: since honor was given to them out of reverence for the divine worship. Hence it was necessary to put aside certain things for them both as to tithes and as to first-fruits, and, again, as to oblations and sacrifices, that they might be afforded a means of livelihood. On the other hand, the rulers, as stated above, were chosen from the whole people; wherefore they had their own possessions, from which to derive a living: and so much the more, since the Lord forbade even a king to have superabundant wealth to make too much show of magnificence: both because he could scarcely avoid the excesses of pride and tyranny, arising from such things, and because, if the rulers were not very rich, and if their office involved much work and anxiety, it would not tempt the ambition of the common people; and would not become an occasion of sedition.
Reply Obj. 5: That right was not given to the king by Divine institution: rather was it foretold that kings would usurp that right, by framing unjust laws, and by degenerating into tyrants who preyed on their subjects. This is clear from the context that follows: "And you shall be his slaves [Douay: 'servants']": which is significative of tyranny, since a tyrant rules is subjects as though they were his slaves. Hence Samuel spoke these words to deter them from asking for a king; since the narrative continues: "But the people would not hear the voice of Samuel." It may happen, however, that even a good king, without being a tyrant, may take away the sons, and make them tribunes and centurions; and may take many things from his subjects in order to secure the common weal. ________________________
SECOND ARTICLE [I-II, Q. 105, Art. 2]
Whether the Judicial Precepts Were Suitably Framed As to the
Relations of One Man with Another?
Objection 1: It would seem that the judicial precepts were not suitably framed as regards the relations of one man with another. Because men cannot live together in peace, if one man takes what belongs to another. But this seems to have been approved by the Law: since it is written (Deut. 23:24): "Going into thy neighbor's vineyard, thou mayest eat as many grapes as thou pleasest." Therefore the Old Law did not make suitable provisions for man's peace.
Obj. 2: Further, one of the chief causes of the downfall of states has been the holding of property by women, as the Philosopher says (Polit. ii, 6). But this was introduced by the Old Law; for it is written (Num. 27:8): "When a man dieth without a son, his inheritance shall pass to his daughter." Therefore the Law made unsuitable provision for the welfare of the people.
Obj. 3: Further, it is most conducive to the preservation of human society that men may provide themselves with necessaries by buying and selling, as stated in Polit. i. But the Old Law took away the force of sales; since it prescribes that in the 50th year of the jubilee all that is sold shall return to the vendor (Lev. 25:28). Therefore in this matter the Law gave the people an unfitting command.