All affection is based on good or on pleasure, either absolute or relative to the person who feels it, and is prompted by similarity of some sort; but this friendship possesses all these attributes in the friends themselves, for they are alike, et cetera, in that way. Also the absolutely good is pleasant absolutely as well; but the absolutely good and pleasant are the chief objects of affection; therefore it is between good men that affection and friendship exist in their fullest and best form. Such friendships are of course rare, because such men are few.
The quote: Moreover they require time and intimacy: as the saying goes, you cannot get to know a man till you have consumed the proverbial amount of salt in his company;
and so you cannot admit him to friendship or really be friends, before each has shown the other that he is worthy of friendship and has won his confidence. People who enter into friendly relations quickly have the wish to be friends, but cannot really be friends without being worthy of friendship, and also knowing each other to be so; the wish to be friends is a quick growth, but friendship is not.