不断学习的人，人生才会不断升华。

The theory of probabilities is at bottom nothing but common sense reduced to calculus.

The health of the soil determines the health of the people.

在一个充满仇恨的世界，我们仍须勇于希望。在一个充满愤怒的世界，我们仍须勇于安慰。在一个充满绝望的世界，我们仍须勇于梦想。在一个充满猜忌的世界，我们仍须勇于相信。

The deep, personal material of the latter half of your life is your children. You can write about your parents when they're gone, but your children are still going to be here, and you're going to want them to come and visit you in the nursing home.