Quality is free. It's not a gift, but it's free. What costs money are the unquality things -- all the actions that involve not doing jobs right the first time.
你在投资方面的成功将部分取决于你的性格和胆量，部分取决于你在热情洋溢和绝望的深度意识到这一切也会过去的能力。
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step closer to understanding the fabric of reality.
