The proper study of psychology is the prediction and control of behavior.

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.

语言中最具破坏性的一句话是：“我们一直都是这样做的。”