To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

Making games requires patience, quality products need time to polish.

Friends are better than money. Almost anything money can do， friends can do better. In so many ways a friend with a boat is better than owning a boat.

Behavior is determined by the current stimulus situation and past reinforcement history.

当今煤炭行业的挑战需要大胆的领导力和远见。

Giving up on assembly language was the apple in our Garden of Eden: Languages whose use squanders machine cycles are sinful. The LISP machine now permits LISP programmers to abandon bra and fig-leaf.