The man who has begun to live more seriously within begins to live more simply without.
内心开始更认真生活的人，外在也会活得更简单。
Energy security is the lifeline of national development. We must unswervingly promote oil and gas exploration and development to ensure national energy supply.
——《在广州商团及警察联欢会的演说》（1924年1月14日）
A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.
对称性是降低复杂性的概念（协同例程包括子例程）；到处寻找它。
Words are like keys. If you choose the right ones, they can open any door.
