"Revolutionary products don't fail because they are shipped too early. They fail because they aren't revised fast enough."

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History is the long struggle of man, by exercise of his reason, to understand his environment and to act upon it. But the modern period has broadened the struggle in a revolutionary way. Man now seeks to understand, and act on, not only his environment, but himself; and this has added, so to speak, a new dimension to reason and a new dimension to history.

— Edward Hallett Carr