1. Friendships of Virtue: This is friendship in the fullest sense, in which the friends are engaged in a common pursuit of the virtuous life. They’re edifying, in that each friend draws the other towards virtue.  Aristotle explains that in this friendship, you wish the best for your friend regardless of pleasure or utility.  So, for example, the virtuous friend is genuinely happy to see you get married or get a promotion, even if it means you’ll have less time to hang out, or won’t be as important a business connection.  Of course, this means that these friendships are only possible among the virtuous.