Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
逻辑学研究不仅仅是关于形式系统,更是关于理解人类推理的本质。
In this trifling affair, that misunderstandings and neglect occasion more mischief in the world than even malice and wickedness. At all events, the two latter are of less frequent occurrence.