Book 7
15
On the other hand friendship based on pleasure is the friendship of the young, for they have a sense of what is pleasant; hence young people’s friendship easily changes, for since their characters change as they grow up, their taste in pleasure also changes. But the friendship in conformity with goodness is the friendship of the best men.
16
It is clear from this that the primary friendship, that of the good, is mutual reciprocity of affection and purpose. For the object of affection is dear to the giver of it, but also the giver of affection is himself dear to the object.
17
This friendship, therefore, only occurs in man, for he alone perceives purpose; but the other forms occur also in the lower animals. Indeed mutual utility manifestly exists to some small extent between the domestic animals and man, and between animals themselves, for instance Herodotus’s account of the friendship between the crocodile and the sandpiper, Hdt. 2.68, says that the trochilus picks leeches out of the crocodile’s throat, Aristot. Hist. An. 9.6.6, that it picks the crocodile’s teeth. In reality it picks gnats from the crocodile’s open mouth. and the perching together and separating of birds of which soothsayers speak.
18
The bad may be each other’s friends from motives both of utility and of pleasure;
19
though some say that they are not really friends, because the primary kind of friendship does not belong to them, since obviously a bad man will injure a bad man, and those who suffer injury from one another do not feel affection for one another.
20
But as a matter of fact bad men do feel affection for one another, though not according to the primary form of friendship—because clearly nothing hinders their being friends under the other forms, since for the sake of pleasure they put up with one another although they are being harmed, so long as they are lacking in self-restraint.
