Albert Einstein in his famous essay “The World As I See It “ said, “I do not at all believe in human freedom in the philosophical sense... Schopenhauer’s saying, ‘A man can do what he wants, but not will what he wants,’ has been a very real inspiration to me since my youth; it has been a continual consolation in the face of life’s hardships, my own and others’, and an unfailing wellspring of tolerance. This realization mercifully mitigates the easily paralyzing sense of responsibility and prevents us from taking ourselves and other people too seriously; it is conducive to a view of life which, in part, gives humour its due.”

An interpretation of this goes like

“The idea, which arises in many forms, is that "freedom" is indeed inevitably paradoxical. There is no such thing as "absolute" freedom nor "absolute" constraint. There are only indeterminacies and determinations on different levels, of which one may or may not be aware.” 我一直想理解这个意思。看来可以说辛弃疾可以用各种比喻来写词抱怨，什么千金纵买相如赋，却不能用做微积分来谋求更远的人生意义，就是欲望的限制了。所以如果他读了叔本华他其实可以嘲笑自己的报宋情结。结论是要多读多想。