学得越多，越明白自己知之甚少。

统计学家不能逃避理清科学推断原理的责任，同样地，任何其他思考者也必须承担类似义务。

In mathematics, the art of proposing a question must be held of higher value than solving it.

The art of progress is to preserve order amid change and to preserve change amid order.

儿童不仅在心理上是被动的，而且像一个空花瓶，是一个有待于充满及塑造的生命。