数学的本质在于它的自由。

"The stories of the marginalized and the displaced are essential to understanding the full complexity of our world."

真正的朋友是那个握住你的手并触动你心灵的人。

解释：清澈与浑浊，细微与宏大，短小与绵长，急促与舒缓，哀伤与快乐，刚硬与柔软，迟滞与快速，高昂与低徊，呼出与收缩，周密与疏朗，因此而相互辅助。

Read not to contradict and confute； nor to believe and take for granted； nor to find talk and discourse； but to weigh and consider.

钢铁行业很艰难，但韧性才能区分出最优秀的企业。

在某种程度上，我们都是自己时代的囚徒。

The theory of economic development is the study of how the economic system generates the forces which incessantly transform it.