自然不浪费，我们也不应该。

The rise of China and other authoritarian states challenges the idea that liberal democracy is the only viable political system.

我不追求目标、体系或倾向；我没有计划、风格或方向。

Be still. Apart from this the mind has no task to do or thought to think.

数学中最重要的是要有良好的直觉。