The human voice is the most beautiful instrument of all, but it is the most difficult to play.

除非你开始改变内在，否则无法改变周围的一切。

没有丑陋的爱，也没有英俊的监狱。

The old-fashioned dictator does not exist under scientific management.

【译文】广泛学习钻研，坚定自己的志向，恳切地提出问题并且联系实际去思考，仁德就在其中了。