Creativity is not a luxury; it is a necessity for a meaningful life.

There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience.

译文：人要是失足犯错就会成为千古的遗恨，再回头时发现已经物是人非事事休。赏析：是感情的动物，常常会因为某些原因，做出令人懊恼悔恨的事。每一个错误，都要付出惨痛的代价。错误越大，代价越惨痛。做了错事，良心不安，别人痛苦，自己更痛苦。

I don't think you need to be sad to write a sad song.