定理不是偶然发现的。
Innovation distinguishes between a leader and a follower.
墨子说：言论如果能够付诸行动的就可以讲；不能够付诸行动的就别多说。言论不能付诸行动的而常讲，这就是卖弄口才了。
What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.