Nothing is a waste of time if you use the experience wisely.
The ultimate tragedy is not the oppression and cruelty by the bad people but the silence over that by the good people.
The power of words can change the world.
滚动的弹丸，掉落到凹陷之处，便不再滚动了；流传的谣言，到智慧的人那里，便不再流传了。