“There may be a series of wars, one after another, going on indefinitely.
Possibly the world will come to its senses sooner than I expect. But, as I have often said, the environment of human life has changed more rapidly and more extensively in recent years than it has ever changed before. When environment changes, there must be a corresponding change in life. That change must be so great that it is not likely to be completed in a decade or in a generation.”

Journal entry (11 December 1941); later published in The Wartime Journals (1970)
Context: We talk about spreading democracy and freedom all over the world, but they are to us words rather than conditions. We haven't even got them here in America, and the farther we get into this war the farther we get away from democracy and freedom. Where is it leading us to, and when will it end? The war might stop this winter, but that is improbable. It may go on for fifty years or more. That also is improbable. The elements are too conflicting and confused to form any accurate judgment of its length. There may be a series of wars, one after another, going on indefinitely.
Possibly the world will come to its senses sooner than I expect. But, as I have often said, the environment of human life has changed more rapidly and more extensively in recent years than it has ever changed before. When environment changes, there must be a corresponding change in life. That change must be so great that it is not likely to be completed in a decade or in a generation.