In mathematics, the simplest questions often lead to the deepest insights.

The real moral test of a society is how it treats those who are at the dawn of life, the children; those who are in the twilight of life, the aged; and those who are in the shadow of life, the sick, the needy and the handicapped.

故事的力量在于它能够改变我们。

"The past is a candle at great distance: too close to let you quit, too far to comfort you."

你能给孩子最伟大的礼物就是自尊的礼物。