It is well know that a vital ingredient of success is not knowing that what you're attempting can't be done.

It is well know that a vital ingredient of success is not knowing that what you're attempting can't be done.

众所周知，成功的一个重要因素就是不知道你所尝试的事情是不可能完成的。

-- Terry Pratchett 泰瑞·普莱契