Freedom is a condition of mind,and the best way to secure it is to breed it.
自由是心灵的状态，获取它的最好方式是培育它。
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.
我认为数学之所以有价值，是因为它具有这种令人难以置信的结构，你可以探索和发现。