做出伟大工作的唯一方法就是热爱你所做的事。
The only way to do great work is to love what you do.
实现明天理想的唯一障碍是今天的疑虑。
Purposive behavior in animals and men.
The individual is reduced to a negligible quantity, perhaps less in his consciousness than in his habits and in the unconscious adjustments of his life.
对民主的最大威胁不是来自外部敌人，而是来自内部腐败和公民美德的丧失。