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The key to understanding human cognition is to understand how symbols are manipulated.
Innovation is seeing what everybody has seen and thinking what nobody has thought.
生活的艺术在于知道何时坚持,何时放手。
"We always overestimate the change that will occur in the next two years and underestimate the change that will occur in the next ten. Don't let yourself be lulled into inaction."
The mind is the most important thing in tennis.