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Changing the destructive things you say to yourself when you experience the setbacks that life deals all of us is the central skill of optimism.
当你经历生活给我们所有人带来的挫折时,改变你对自己说的那些破坏性的话是乐观的核心技能。
The more time I spent on mathematics, the more excited I got.
The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome of the historical process.