The real wealth of a nation grows from its soil.
The key to solving complex problems is to ask the right causal questions.
The more we understand individual things， the more we understand God.
We ought not to act and speak as if we were asleep.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。
没有一些目标和一些努力去实现它们，没有人能够生存。我们所谓的生活是一场旅程，而旅程本身就是家。