人生的主要任务是诞生自己。

The chief beauty about time is that you cannot waste it in advance. The next year, the next day, the next hour are lying ready for you, as perfect, as unspoiled, as if you had never wasted or misapplied a single moment in all your life. You can turn over a new leaf every hour if you choose.

学习数学的唯一方法就是做数学。

你最不满意的客户是你最大的学习来源。