David reveals joy's ultimate source in God's presence. The "path of life" represents "the way to an endless, immortal, and blessed life after death" - a path "in which life is to be found." "Fullness of joy" means "satiety of joy - enough, and more than enough, to satisfy the extremest cravings of the human heart."
At God's "right hand" are "pleasures for evermore" - an "inexhaustible store, which may be drawn upon for ever." These promises transcend earthly experiences, pointing to divine communion that provides complete satisfaction (BibleHub Commentaries).
