世界上最好和最美的东西是看不见甚至摸不着的——它们必须用心去感受。

韧性不仅仅是恢复，更是向前迈进。

In quantum mechanics, the act of measurement can change the state of the system being measured.

"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."

历史学家必须兼具诗人和哲学家的特质。