True knowledge comes from inner insight.

What I want to talk to you about today is the difference between gifts and choices. Cleverness is a gift， kindness is a choice. Gifts are easy -- they're given after all. Choices can be hard. You can seduce yourself with your gifts if you're not careful， and if you do， it'll probably be to the detriment of your choices.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

Perception is an active process where the brain constructs meaning from sensory input.

最重要的是你要有一个北极星，你必须知道自己要去哪里。

发现恒星围绕银河系中心的超大质量黑洞运行是天体物理学的一个转折点。