Marriage is one long conversation, chequered by disputes.

Robert Louis Stevenson (1850–1894) Scottish essayist, novelist, poet

Essay (1882-08), “Talk and Talkers (A Sequel),” Cornhill Magazine, Vol. 46
    (Source)

Collected in Memories and Portraits, ch. 11 (1886).

See also See Wilde (1897), Mencken (1945).