It is essential to the sanity of mankind that each one should think the other crazy- a condition with which the cynicism of human nature so cordially complies, one could wish it were a concurrence upon a subject more noble.
(Emily Dickinson, notebook, c.1880)

"It takes your enemy and your friend, working together, to hurt you to the heart; the one to slander you and the other to get the news to you."
(Mark Twain, 1887)

"They will say you are on the wrong road if it is your own."
Antonia Porchia (b 1885-d.1968)