每一个数学问题都是通向更深入理解世界的窗口。
Every mathematical problem is a window into a deeper understanding of the world.
I never buy a stock unless I understand the business.
Growth comes from pushing boundaries.
The invention of the cotton gin was the result of necessity and observation.
解读：绝对的自由会让拥有更多资源、权力的强者肆意妄为，他们会凭借优势去压榨弱势群体，抢占利益。所以，用道德、法律来框定自由边界，是守护社会公平、保障弱者权益的必需。