Adversity is sometimes hard upon a man; but for one man who can stand prosperity there are a hundred that will stand adversity.

Thomas Carlyle (1795-1881) Scottish essayist and historian

Lecture (1840-05-19), “The Hero as Man of Letters,” Home House, Portman Square, London
    (Source)

The lecture notes were collected by Carlyle into On Heroes, Hero-Worship, & the Heroic in History, Lecture 5 (1841).