积财千万，不如薄伎在身。
积累千万财富，不如掌握一门小技艺。
The essence of mathematics lies in its freedom.
I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.
石油化工的未来在于可持续性和高效性。