Friendliness is considered to be justice in the fullest sense.
Friendship is clearly necessary and splendid, but people disagree on its precise nature. Friendship consists of a mutual feeling of goodwill between two people.
There are three kinds of friendship. The first is friendship based on utility, where both people derive some benefit from each other. The second is friendship based on pleasure, where both people are drawn to the other’s wit, good looks, or other pleasant qualities. The third is friendship based on goodness, where both people admire the other’s goodness and help one another strive for goodness.
The first two kinds of friendship are only accidental, because in these cases friends are motivated by their own utility and pleasure, not by anything essential to the nature of the friend. Both of these kinds of friendship are short-lived because one’s needs and pleasures are apt to change over time.
Goodness is an enduring quality, so friendships based on goodness tend to be long lasting. This friendship encompasses the other two, as good friends are useful to one another and please one another. Such friendship is rare and takes time to develop, but it is the best. Bad people can be friends for reasons of pleasure or utility, but only good people can be friends for each other’s sake.
On the whole, friendships consist of equal exchanges, whether of utility, pleasantness, or goodness. However, there are some relationships that by their nature exist between two people of unequal standing: father-son, husband-wife, ruler-subject. In these relationships, a different kind of love is called for from each party, and the amount of love should be proportional to the merit of each person. For instance, a subject should show more love for a ruler than the the reverse. When there is too great a gap between people, friendship is impossible, and often two friends will grow apart if one becomes far more virtuous than the other.
Most people prefer being loved to loving, since they desire flattery and honor. The true mark of friendship, though, is that it consists more of loving than of being loved. Friendships endure when each friend loves the other according to the other’s merit.