The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
自由不是给予的,而是夺取的。
我们唯一需要害怕的是恐惧本身的缺失。
Liberty cannot be preserved without a general knowledge among the people.
We don't inherit the earth from our ancestors; we borrow it from our children—this is especially true in forestry.