Happiness and sadness are two sides of one coin. Their relationship is as intricate and inseparable as the bond between day and night. To declare a preference for one over the other is to imply that you cannot see the hidden link. Does that mean that we must experience both in equal measures?
......Of course not. Those who love the night soon find a way to sleep throughout the day.

I guess what we need to remember is that "to desire anything too intensely brings potential for disappointment!".