We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.

I prefer to supervise the whole operations of the government myself rather than entrust the public business to subordinates, and this makes my duties very great.

试图独自生活的人不会成功。如果他的心不回应另一颗心，他的心就会枯萎。如果他只听到自己思想的回声而找不到其他灵感，他的思想就会萎缩。

你必须愿意失败才能成功。