It is no use saying, 'We are doing our best.' You have got to succeed in doing what is necessary.

万物纷繁各自返回根本，返回根本复归生命就能长存。

The motor of our ingenuity is the question ‘Does it have to be like this?’, from which arise political reforms, scientific developments, improved relationships, better books.

数学的历史是人类好奇心和创造力的历史。

我们死去是为了证明我们曾活过。