Here is a cutout from it:
"opposites are distinct things in their own right it is important to recognize that each coexist by consent of its other half. For example you cannot have up without down or sickness without health, remove one from existence and you have to remove the other. The significance of this to our lives results from the understanding that this fundamental rule also applies to conditions such as happiness and sadness. We are all taught to seek happiness but what we fail to realize is that happiness cannot exist without sadness; therefore if we seek happiness we are destined to encounter sadness because both depend on each other for their existence. How can this happen?"