The difference between a policy and a crusade is that a policy is judged by its results, while a crusade is judged by how good it makes its crusaders feel.

Age is foolish and forgetful when it underestimates youth.

数学让我们看到支配周围世界的隐藏结构。

译文：一句话不小心就会招致祸患，一件事不小心就会玷污名节。赏析：口无遮拦的人迟早会给自己带来祸患，行为不检点之人更会玷污自己的名节。我们的一言一行不仅关乎名节，更关乎性命，所以，我们要谨言慎行。

The process of making a film is just as important as the final product.