数学的本质在于它的自由。
While you invent, don't select. While you sketch, don't inspect. While you write the first draft, don't reflect.
The secret of change is to focus all of your energy,not on fighting the old,but on building the new.
改变的秘诀是集中你的所有能力,不是摧毁旧的,而是建造新的。
如果时空穿梭是可能的,那从未来穿越回来的旅客在哪里呢?
如果投资是有趣的,如果你玩得开心,你可能赚不到钱。好的投资是无聊的。