A negative experience suggests to the mind on how to feel, but the mind decides whether to embrace it or feel otherwise.
A negative mind sees happiness as a mystery. So it swims from coast to coast searching for it with a doubtful mindset. Sooner or later, it gives up on it, and comes to conclusion that happiness is an impossible task to achieve. But a positive mind sees happiness as a matter of deciding to focus on the positive side of its life's experiences instead of allowing its negative experiences to hold it in everlasting bondage.