法律体系是根据其自身的有效性标准而有效的规则体系。

Each success only buys an admission ticket to a more difficult problem.

心即一切。你想什么，就会成为什么。

The death of a beautiful woman is, unquestionably, the most poetical topic in the world.

To live is to be constantly learning.

A scientist in his laboratory is not a mere technician: he is also a child confronting natural phenomena that impress him as though they were fairy tales.