To read is to travel without moving.
成功不在于金钱，而在于爱。
It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to Heaven, we were all doing direct the other way.
"The world is a book, and those who do not travel read only one page."
计算复杂性的研究不仅仅是关于问题的分类；它是关于理解计算本身的本质。