...Now, it is natural to all men to love each other. The mark of this is the fact that a man, by some natural prompting, comes to the aid of any man in need, even if he does not know him. For instance, he may call him back from the wrong road, help him up from a fall, and other actions like that: "as if every man were naturally the familiar and friend of every man."...
Thomas Aquinas, Summa Contra Gentiles III.117.6.
