What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.

Writing is about making something, not about expressing yourself.

Without a good user experience, even the best business model is just talk.

数学不仅仅是抽象理论的集合，而是描述宇宙的语言。