Contemplating the weaknesses of others is easy； contemplating the weaknesses in yourself is hard， but it pays a much higher reward.
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
To understand the mind, follow its practical consequences.
Anyone who isn't embarrassed of who they were last year probably isn't learning enough.
I don't think that when people grow up, they will become more broad-minded and can accept everything.Conversely, I think it's a selecting process, knowing what's the most important and what's the least. And then be a simple man.