每一个巨大而深刻的困难本身都包含着它的解决方案。它迫使我们改变思维以找到解决方案。
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.
Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.
数字是形式和思想的统治者，也是神祇和恶魔的原因。