“It is difficult to be patient with many communists; they have developed a peculiar method of irritating others. But they are a sorely tried people, and, outside the Soviet Union, they have to contend against enormous difficulties. I have always admitted their great courage and capacity for sacrifice. They suffer greatly, as unhappily untold millions suffer in various ways, but not blindly before a malign and all-powerful fate. They suffer as human beings, and there is a tragic nobility about such suffering.”

The Goblet of Life, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Source: The Count of Monte Cristo

Variant: People have to really suffer before they can risk doing what they love.
Source: Diary

The Bertrams (1859), Ch. 5 http://books.google.com/books?id=BKwxAQAAMAAJ&q=%22Those+who+have+courage+to+love+should+have+courage+to+suffer%22&pg=PA77#v=onepage

Quoted in Jeffrey Moussaieff Masson, The Face on Your Plate: The Truth About Food (New York: Norton & Company, 2009, ISBN 978-0-393-06595-4), p. 137 https://books.google.it/books?id=vqucAwAAQBAJ&pg=PA137&lpg=PA137
Attributed

Source: "The Black Manifesto" (1969), p. 116

Source: Galilee

Testifying before the Truth and Reconciliation Commission at a special hearing in Cape Town https://web.archive.org/web/20050119042614/http://www.doj.gov.za:80/trc/media/1997/9705/s970514a.htm (May 1997)
1990s, 1997