A sick man that gets talking about himself, a woman that gets talking about her baby, and an author that begins reading out of his own book, never know when to stop.

Oliver Wendell Holmes, Sr. (1809–1894) American poet, essayist, scholar

Article (1872-11), “The Poet at the Breakfast-Table,” Atlantic Monthly
    (Source)

Collected in The Poet at the Breakfast-Table, ch. 11 (1872).