可持续采石不是选择，而是我们对后代的责任。

试图在不激发学生学习欲望的情况下进行教学的老师，就像在冷铁上敲打。

Technology should solve real problems, not just create new toys.

解释：没有不犯错误的完人，只要能及时改正自己的错误，就是最好的了。

【讲解】：古代读书人学习的目的，在于修养自己的学问道德（然后去为国家、人民服务），现在读书人学习的目的，在于给别人看（希望得到别人的赞美和任用）。

The most important thing in leadership is to listen—really listen—to the people around you.

No testimony is sufficient to establish a miracle unless the testimony be of such a kind that its falsehood would be more miraculous than the fact which it endeavors to establish.