前因，後果

那男人吞下一顆神奇的小藥丸
那女人吞下一顆彌補的事後丸

祂忘了說 除了伊甸園裡的蘋果以外
有些東西  也不可輕易入口

於是、我們有了牛頓的三大原理中的定律之一：

【Newton's Law III】
To every action there is always opposed an equal reaction:
or, the mutual actions of two bodies upon each other are always equal,
and directed to contrary parts.