It is much easier to change how you think by changing your behavior， than it is to change your behavior by changing how you think. Act out the change you seek.
「通过改变行为来改变你的想法」要比「通过改变想法来改变你的行为」更容易实现。把你所追求的改变付诸行动。
"To be hopeful in bad times is not just foolishly romantic. It is based on the fact that human history is a history not only of cruelty, but also of compassion, sacrifice, courage, kindness."
He who fights with monsters should be careful lest he thereby become a monster.