2004年9月13日，81岁的杨振宁在清华大学开始为本科生讲授普通物理。他说

Anxiety is the dizziness of freedom.

真正的友情在困难时才会被考验。

Stories you read when you're the right age never quite leave you. You may forget who wrote them or what the story was called. Sometimes you'll forget precisely what happened, but if a story touches you it will stay with you, haunting the places in your mind that you rarely ever visit.

The most important thing is to be true to yourself, to your own voice, to your own vision.

世界是一本书，不旅行的人只读了一页。

公司最宝贵的资产是员工；投资于他们，他们将超越期望。