More and more do I feel, as I advance in life, how little we really know of each other. Friendship seems to me like the touch of musical-glasses--it is only contact; but the glasses themselves, and their contents, remain quite distinct and unmingled.
Henry Wadsworth Longfellow (1888). “Longfellow's Days: The Longfellow Prose Birthday Book : Extracts from the Journals and Letters of H. W. Longfellow”