We must be free not because we claim freedom, but because we practice it.
Focus on progress, not perfection.
最伟大的礼物是对阅读的热情。
The task of diplomacy is to extend the time for decision.
行为主义者放在自己面前的规则或衡量标准总是:我能否用"刺激和反应"来描述我所看到的这一行为?