If a man is proud of his wealth,he should not be praised until it is known how he employs it.
如果一个人以他的财富为骄傲,那么要看他如何运用财富,才知道他是否应该被称赞。
数学不是一项观赏性运动;要理解它,必须积极参与其中。
Everything has a beginning and an end.