Internal mental events are irrelevant to the scientific study of behavior.

我不完美，但我追求完美。

I'm interested in the edges of things.

The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.

物理学的魅力在于它能够用简单的原理解释复杂的事物。

What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.