In his mouth, i.e. to his taste, though it greatly please him for the present.
Though he hide it under his tongue; as an epicure doth a sweet morsel, which he is loth to swallow, and therefore keeps and rolls it about his mouth that he may longer enjoy the pleasure of it: though he be highly pleased with his lusts, and cleave to them in hearty love, and resolve to hold them fast, and improve them to the greatest delight and advantage.