Only when something of value to make the purpose of their lives have value.
只有在以某种有价值的东西做目的时，性命才有价值。
行为由当前刺激情境和过去的强化历史决定。
The best traders are those who can adapt to changing market conditions.
在我看来，一种信仰只是一个信仰现象，信仰的内容无足轻重。