The man who does not work for the love of work but only for money is not likely to make money nor to find much fun in life.

The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.

The actions of men are the best interpreters of their thoughts.

Fear can hold you prisoner. Hope can set you free.

The best literature is that which challenges us, which makes us think, which forces us to confront the uncomfortable truths of our existence.

I don’t let fear control me, I control fear.

译文：一心想求取科举功名的人，不一定能体会到琴棋书画的乐趣；追求生命境界的人，不能没有经世济民的才能。赏析：读书或做事，我们不能总是带着功利性极强的目的去。目的越强，中间的乐趣无法体会，其结果往往事与愿违。如果我们抱着一颗平常心，往往会有意想不到的收获。那些道德品质高尚的人大多博学有才，他们用自身的言行去改变周围的人，去改变这个社会。