我们利用现有的东西，因为它们有价值
The books that we reread the most are the ones that most clearly describe the world we already know.
我们重读最多的书是那些最清楚地描述我们已经知道的世界的书。
The goal of mathematics is to understand the patterns of the universe.
The world owes all its onward impulses to men ill at ease; the happy man inevitably confines himself within ancient limits.
这个世界是个美好的地方，值得为之奋斗。