There are lights which ascend and lights which descend. The ascending lights are the lights of the heart; the descending lights are those of the Throne. The false self is the veil between the Throne and the heart, like springs toward like. Light ascends toward light and light descends upon light, and "it is light upon light."
A joyful mind is very ordinary and relaxed... When your aspiration is to lighten up, you begin to have a sense of humor. Things just keep popping your serious state of mind. In addition to a sense of humor, a basic support for a joyful mind is curiosity, paying attention, taking an interest in the world around you... Noticing everything. Appreciate everything, including the ordinary. That's how to click in with JOYfulness.