Joy and sorrow can materialize only after you register physical changes in the body writes Joseph Goldstein in If There Is No Self, Who Is Born, Who Dies, Who Meditates?,

When anger arises, or sorrow or love or joy, it is just anger angering, sorrow sorrowing, love loving, joy joying. Different feelings arise and pass, each simply expressing its own nature. The problem arises when we identify with these feelings, or thoughts, or sensations as being self or as belonging to ‘me’: I’m angry, I’m sad.