The most important thing is to focus on the user and all else will follow.
Your 20s are the perfect time to do a few things that are unusual， weird， bold， risky， unexplainable， crazy， unprofitable， and look nothing like "success". For the rest of your life， these experiences will serve as your muse
真理的概念在任何足够强大以包含算术的形式系统中都是不可定义的。
困难不在于提出新观念，而在于摆脱旧观念。
政治制度的力量在于其适应变化环境的能力。
第一项任务是理解问题，第二项是找到解决方案，第三项是执行它。
Elegance is not a dispensable luxury but a quality that decides between success and failure.