“For man, unlike any other thing organic or inorganic in the universe, grows beyond his work, walks up the stairs of his concepts, emerges ahead of his accomplishments. This you may say of man—when theories change and crash, when schools, philosophies, when narrow dark alleys of thought, national, religious, economic, grow and disintegrate, man reaches, stumbles forward, painfully, mistakenly sometimes. Having stepped forward, he may slip back, but only half a step, never the full step back. This you may say and know it and know it. This you may know when the bombs plummet out of the black planes on the market place, when prisoners are stuck like pigs, when the crushed bodies drain filthily in the dust. You may know it in this way. If the step were not being taken, if the stumbling-forward ache were not alive, the bombs would not fall, the throats would not be cut. Fear the time when the bombs stop falling while the bombers live—for every bomb is proof that the spirit has not died. And fear the time when the strikes stop while the great owners live—for every little beaten strike is proof that the step is being taken.”

from The Grapes of Wrath by John Steinbeck