Something is going on at this moment in dozens of ward-rooms, bar-rooms, common-rooms, messes and golf-clubs. I prefer to call it Companionship—or Clubbableness. This Companionship is, however, only the matrix of Friendship. It is often called Friendship, and many people when they speak of their “friends” mean only their companions. But it is not Friendship in the sense I give to the word. By saying this I do not at all intend to disparage the merely Clubbable relation. We do not disparage silver by distinguishing it from gold.
Friendship arises out of mere Companionship when two or more of the companions discover that they have in common some insight or interest or even taste which the others do not share and which, till that moment, each believed to be his own unique treasure (or burden). The typical expression of opening Friendship would be something like, “What? You too? I thought I was the only one.”
C.S. Lewis, The Four Loves (1960; Harcourt Brace: 1991) 65.