It is not enough to understand or to see clearly. The future will be shaped in the arena of human activity by those willing to commit their minds and their bodies to the task.
Look back over the past with its changing empires that rose and fell and you can foresee the future too.
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The reason people find it so hard to be happy is that they always see the past better than it was the present worse than it is and the future less resolved than it will be.