Good can exist without evil， whereas evil cannot exist without good.
善可以存在于没有恶的情况下，而恶无法在没有善的情况下存在。
你能给予他人的最伟大的礼物是你的时间和你的声音。
The only person you should try to be better than is the person you were yesterday.
跳舞吧，像没有人观看一样；去爱吧，像从未受过伤害一样。
Psychology must be based on observable phenomena, not abstractions.
The key to performance is elegance, not battalions of special cases.
