From C.S. Lewis, as quoted in Tim Keller’s The Meaning of Marriage:
Friendship arises…when two or more..discover that they have in common some insight or interest….[A]s Emerson said, Do you love me? means Do you see the same truth?–or at least, Do you care about the same truth? The man who agrees with us that some question, little regarded by others, is of great importance can be our Friend….That is why those pathetic people who simply “want friends” can never make any. The very condition of having friends is that we should want something else besides friends. Where the truthful answer to the question “Do you see the same truth?” would be “I don’t care about the truth–I only want [you to be my] friend,” no friendship can arise. Friendship must be about something, even if it were only an enthusiasm for dominoes or white mice. Those who have nothing can share nothing; those who are going nowhere can have no fellow-travelers.