Aristotle, presupposing that private ownership is a right, finds legitimate titles to property in traditional occupation, in conquest, in labor. He also holds that man is by his nature destined to live in society, since he has need of his fellow men for defense, for full use of exterior goods, for acquiring even elementary knowledge. Language itself shows that man is destined for society. Hence families unite to form the political unity of the city, which has for its purpose a good common to all, a good that is not merely useful and pleasurable, but is in itself good, since it is a good characteristic of rational beings, a good based on justice and equity, virtues that are indispensable in social life.
76. IIae, q. 94, a. 5, ad 3; IIa IIae, q. 10, a. 10; q. 104, a. 5.
77. See the first chapter of that work.
78. See the Summa, Ia IIae, q. 105, a. 1.
79. De regimine principum I, 6.
80. Si paulatim idem populus depravatus habeat venale suffragium, et regimen flagitiosis, sceleratisque committat, recte adimitur populo talis potestas dandi honores, et ad paucorum bonorum redit arbitrium.