Flow is being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost.

在数学中，提出问题的艺术必须比解决问题更有价值。

未来将类似于过去是一个逻辑上必然的真理。

如果你不放弃，你还有机会。放弃是最大的失败。