In order to be friends, then, they must be well-wishers one of another, i.e. must wish each other’s good from one of the three motives above mentioned, and be aware of each other’s feelings.

But these three motives are specifically different from one another; the several affections and friendships based upon them, therefore, will also be specifically different. The kinds of friendship accordingly are three, being equal in number to the motives of love; for any one of these may be the basis of a mutual affection of which each is aware.

Now, those who love one another wish each other’s good in respect of that which is the motive of their love. Those, therefore, whose love for one another is based on the useful, do not love each other for what they are, but only in so far as each gets some good from the other.