"In the end, we will remember not the words of our enemies, but the silence of our friends."

 金钱都是一种信仰问题。

To understand the meaning of a sentence， we must consider the speaker's intention and the context of the utterance.

计算复杂性的研究告诉我们，有些问题本质上是困难的，无论我们的算法多么聪明。