书籍是我们能送给孩子的最珍贵的礼物。

"We are all in the gutter, but some of us are looking at the stars."

Time erodes all such beauty, but what it cannot diminish… is the wonderful workings of your mind. Your humor, your kindness… and your moral courage.

When speaking to an audience it’s better to fix your gaze on a few people than to “spray” your gaze across the room. Your eyes telegraph to others whether you really believe what you are saying.

相对论不仅仅是一种科学理论；它是一种哲学理论。