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.

Every experiment, whether successful or not, is a step toward understanding.

最伟大的老师是那些告诉你去哪里看，但不告诉你该看到什么的人。