每个个体改善自身状况的自然努力，当在自由和安全的情况下得以发挥时，是如此强大，以至于它不仅能够独自，不受任何协助，推动社会走向富裕和繁荣，而且能够克服往往由愚蠢的人类法律造成的百般妨碍。
The pleasure isn’t in owning the person. The pleasure is this. Having another contender in the room with you.
The best investment you can make is in yourself.
活着是世界上最罕见的事情。大多数人只是存在，仅此而已。
发现说谎者悖论及相关悖论使人们认识到，直觉上的真理概念并不像乍看起来那么简单。
失败只是通往成功的垫脚石。
A man knows when he is growing old because he begins to look like his father.
Mental activity is the organism's dialogue with its environment.