Richelle E. Goodrich said this quote

Happiness is a frame of mind. It is a state of thinking. It is an attitude, a headset, a mentality. Happiness is a disposition and demeanor. It is a mood and sensibility. It is a philosophy, a notion, a tone, an outlook and perspective. Happiness is all of these things, none of which exist separate from me. They cannot be extracted or stolen because they constitute my very being. Therefore, happiness must be the natural essence of me.