数学的力量来自于它的抽象和概括能力，将具体问题转化为普遍真理。

"The dead are the only ones who truly know us."

Responsible forestry isn't about limiting progress—it's about redefining what progress means.

The history of philosophy is not, like the history of the sciences, to be considered as a mere chronological record of discoveries and errors. It is the history of the human spirit in its endeavor to understand itself and its relation to the universe.

幸福的关键因素并非是物质的或审美的，而永远是心理上的。《旅行的艺术》