你说的话有什么益处呢？如果没有益处还要说，就是白费口舌。 

The world is full of people who will tell you what you can't do. You don't need them. You already know what you can't do. What you need is someone to tell you what you can.

All human knowledge is from experience.

创新来自于挑战现状并接受新想法。