St. Augustine, City of God
19.24 (tr. Marcus Dodds):
But if we discard this definition of a people, and, assuming another, say that a people is an assemblage of reasonable beings bound together by a common agreement as to the objects of their love, then, in order to discover the character of any people, we have only to observe what they love. Yet whatever it loves, if only it is an assemblage of reasonable beings and not of beasts, and is bound together by an agreement as to the objects of love, it is reasonably called a people; and it will be a superior people in proportion as it is bound together by higher interests, inferior in proportion as it is bound together by lower.
Si autem populus non isto, sed alio definiatur modo, velut si dicatur: "Populus est coetus multitudinis rationalis rerum quas diligit concordi communione sociatus", profecto, ut videatur qualis quisque populus sit, illa sunt intuenda, quae diligit. Quaecumque tamen diligat, si coetus est multitudinis non pecorum, sed rationalium creaturarum et eorum quae diligit concordi communione sociatus est, non absurde populus nuncupatur; tanto utique melior, quanto in melioribus, tantoque deterior, quanto est in deterioribus concors.