“When you do things from your soul, you feel a river moving in you, a joy.”― Rumi
Joy is a feeling that sums up a lot more than happiness. To me, joy speaks to a much deeper experience of something almost too beautiful to describe in words. (I think our human languages are limited in the expression of the soul) Just as doing things from your soul is a deeper experience than simply going through the motions of life.
Finding joy in the experience of life, and living from a soul level - well, that just feels like the "good stuff". The stuff that makes this life so much more beautiful.