Good breeding consists in concealing how much we think of ourselves and how little we think of the other person.

Mark Twain (1835-1910) American writer [pseud. of Samuel Clemens]

Note (1898-07-04), Mark Twain’s Notebook, ch. 21 “In Vienna” (1935) [ed. Albert Bigelow Paine]
    (Source)

While summering in Kaltenleutgeben, Austria.