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The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.
忧虑是人们生存的重要条件。与忧虑的正面交锋可以为我们驱赶厌倦感,使我们的感觉更加敏锐,并且保持人类生存所必须的压力。