"Only through suffering does one understand the depth of life."

逻辑学研究不仅仅是关于正确推理，而是关于思想的解放。

The key to making a great film is to have a clear vision and to stick to it.

职业生涯是攀爬架，而不是梯子。

Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something and that this thing must be attained.

The essence of mathematics lies in its freedom.