理解程序的最好方法是尝试改变它。
The best way to understand a program is to try to change it.
猴子爬得越高，尾巴露得越多。
The deepest theorems in mathematics often have the simplest statements.
Over the piano was printed a notice: Please do not shoot the pianist. He is doing his best.
"The challenge of quantum mechanics is not in its complexity, but in its simplicity—it forces us to rethink our most basic assumptions about the universe."