No man can know where he is going unless he knows exactly where he has been and exactly how he arrived at his present place.

No man can know where he is going unless he knows exactly where he has been and exactly how he arrived at his present place.

没有人能知道他要去哪里，除非他确切地知道他曾经到过什么地方，确切地知道他是怎样到达现在这个地方的。

-- Maya Angelou 玛雅·安杰洛