以前的事不要再评说了，做完的事不要再议论了，过去了就不要再追咎。
The study of computational complexity is not just about classifying problems; it is about understanding the nature of computation itself.
啊，过一种感受而非思考的生活吧！
The Moving Finger writes; and, having writ, Moves on: nor all thy Piety nor Wit Shall lure it back to cancel half a Line, Nor all thy Tears wash out a Word of it.