I think that all things which evoke discipline: study, and our duties to men and to the commonwealth, war, and personal hardship, and even the need for subsistence, ought to be greeted by us with profound gratitude, for only through them can we attain to the least detachment; and only so can we know peace.
J. Robert Oppenheimer's letter to his brother Frank Oppenheimer (March 12, 1932), as quoted in "Robert Oppenheimer: Letters and Recollections" edited by Alice Kimball Smith (p. 155), 1995.
