The only limits that exist are the ones you place on yourself.
To understand recursion, one must first understand recursion.
 True courage is facing one's own weaknesses and striving to change.
The best way to predict the future is to create it.
一个把平等置于自由之上的社会两者都得不到。一个把自由置于平等之上的社会在很大程度上可以两者兼得。
过去并不属于我们,而我们属于过去。