Psychological theories must pass the test of practical experience.
In business, the only constant is change, and adaptability is our greatest asset.
I don't like being defined because I'm ever-changing.
心理学是精神生活的科学,而不仅仅是其元素的分类。
我们不应承认自然事物的原因多于那些既真实又足以解释其现象的原因。
The best preparation for tomorrow is doing your best today.