Have you ever noticed how sorrow (which is entirely a mental state) will depress and devitalize you, regardless of any amount of exercise or health foods you may take?

• 你还可曾注意到悲伤（这也是一种精神状态）是如何将你击垮使你萎靡不振的吗？“悲伤到来时，不论你做什么运动吃什么补品都于事无补。”）