Psychological theories must pass the test of practical experience.
心理学理论必须通过实践经验的检验。
写作是一门需要激情、纪律和毅力的手艺。
We must balance the need for energy today with the imperative of protecting the planet for tomorrow.
我们必须平衡当今的能源需求与保护地球未来的必要性。
The state is the people organized for law.