Cheerfulness comes naturally with meditation. It is a quality of space created within the mind. When there’s space in the mind, the mind relaxes, and we feel a simple sense of delight. We experience the possibility of living a life in which we are not continuously aggravated by emotions, discursiveness, and concepts about the nature of things…. Despite all the ups and downs of our life, we are fundamentally awake individuals who have a natural ability to become compassionate and wise. Our nature is to be cheerful. This cheerfulness is deeper than temporary conditions. The day does not have to be sunny for us to be cheerful.
Sakyong Mipham Rinpoche
This cheerfulness is deeper than temporary conditions
That says it all. More permanent than any thought or emotion, temporary conditions. Our emotions change sometimes instantly.