"When we long for life without difficulties, remind us that oaks grow strong in contrary winds and diamonds are made under pressure."
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Source : Peter Marshall (1949). “Prayers Offered by the Chaplain, the Rev. Peter Marshall, D.D.: At the Opening of the Daily Sessions of the Senate of the United States During the Eightieth and Eighty-first Congress 1947-1949”
Source : Etty Hillesum, K. A. D. Smelik, Arnold Pomerans (2002). “Etty: The Letters and Diaries of Etty Hillesum, 1941-1943”, p.550, Wm. B. Eerdmans Publishing