The writer’s life is a life of doubt.
The quarries we rehabilitate best become assets our grandchildren will thank us for.
生活上，不能吃光，不能穿光，说话时留有余地；处事上，又要懂得，又要做得，遇逆境还要善于忍耐。
The challenge of modern physics is not just to find answers but to ask the right questions.
译文：头顶三尺之高，一定会有监督行为的神明；所以无论是收获福祉，还是避开祸难都是由自身决定的。