Forever and ever

6-67-8, 6-67-876, 8-89, 6-67-8, 6-67-876, 8-89 666, -6-6-6, -7-7-7, 7-7-6-9, 7-7, -668, -7-6, 666, -6-6-6, -7-7-7, 7-7-6-9, 7-7, -668, -7-6