History is the shadow cast by the present.

"The past is always tense, the future perfect."

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

恩泽中可能潜藏祸患，所以得意时要能尽早回头；失败后反而能够成功，因此失意时千万不要气馁。