The only person you should try to be better than is the person you were yesterday.

To overcome the anxieties and depressions of contemporary life, individuals must become independent of the social environment to the degree that they no longer respond exclusively in terms of its rewards and punishments.

当孩子被放在自然环境里，他会显示出自己的能力。

为伟大的事业捐躯，从来就不能算作是失败。