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

True leadership means helping others to be better than they thought they could be.

The Jesus of Suburbia is a lie

Quality starts from the seed, not just the harvest.

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

错误经不起失败，但是真理却不怕失败。

经验的直接内容是我们唯一可以知道的现实。