Don't wait until everything is just right. It will never be perfect. There will always be challenges, obstacles and less than perfect conditions. So what. Get started now. With each step you take, you will grow stronger and stronger, more and more skilled, more and more self-confident and more and more successful.

要么致富，要么死在尝试的路上。

Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.

Art can be a form of activism.