如果道歉夹带了借口，那就算不上是道歉。如果称赞夹带了要求，那就算不上是称赞。
It is never too late to be what you might have been.
The end of wisdom is to dream high enough to lose the dream in the seeking of it.
If liberty means anything at all, it means the right to tell people what they do not want to hear.
The boundary between physics and mathematics is not as clear-cut as we might think.