解释：观察与他交游的人，就知道他的品行好坏。

Understanding the psychology of decision-making can help us make better choices in life.

On progress: "If you're competitor-focused， you have to wait until there is a competitor doing something. Being customer-focused allows you to be more pioneering."

The purpose of life is the pursuit of truth and virtue.

快乐激发玩耍的冲动，兴趣激发探索的冲动，满足激发品味和整合的冲动，而爱在安全、亲密的关系中激发这些冲动的循环往复。