In mathematics, truth is always relative to the system you're working in.
The difference between a dream and reality is action.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
Every stroke, every breath, every moment is a step closer to your goal.
The world is full of obvious things which nobody by any chance ever observes.
郦波在讲座中引用苏格拉底的话并加以阐释