Machiavelli said in that famous chapter 25, that the prince, if he is lucky, will master fortuna about half the time, only about 50% of the time.

马基雅维利在有名的第25章里说，君主，如果他幸运的话，可以在一半的时间里掌握命运，仅仅是50%的时间。

耶鲁公开课 - 政治哲学导论课程节选