Thus the compassionate river god gave Psyche instructions how to accomplish her task, and by observing his directions she soon returned to Venus with her arms full of the golden fleece; but she received not the approbation of her implacable mistress, who said, “I know very well it is by none of your own doings that you have succeeded in this task, and I am not satisfied yet that you have any capacity to make yourself useful. But I have another task for you. Here, take this box and go your way to the infernal shades, and give this box to Proserpine and say, ‘My mistress Venus desires you to send her a little of your beauty, for in tending her sick son she has lost some of her own.’ Be not too long on your errand, for I must paint myself with it to appear at the circle of the gods and goddesses this evening.”

Psyche was now satisfied that her destruction was at hand, being obliged to go with her own feet directly down to Erebus. Wherefore, to make no delay of what was not to be avoided, she goes to the top of a high tower to precipitate herself headlong, thus to descend the shortest way to the shades below. But a voice from the tower said to her, “Why, poor unlucky girl, dost thou design to put an end to thy days in so dreadful a manner? And what cowardice makes thee sink under this last danger who hast been so miraculously supported in all thy former?” Then the voice told her how by a certain cave she might reach the realms of Pluto, and how to avoid all the dangers of the road, to pass by Cerberus, the three-headed dog, and prevail on Charon, the ferryman, to take her across the black river and bring her back again. But the voice added, “When Proserpine has given you the box filled with her beauty, of all things this is chiefly to be observed by you, that you never once open or look into the box nor allow your curiosity to pry into the treasure of the beauty of the goddesses.”

Bulfinch's Mythology — Part 71

Psyche, encouraged by this advice, obeyed it in all things, and taking heed to her ways travelled safely to the kingdom of Pluto. She was admitted to the palace of Proserpine, and without accepting the delicate seat or delicious banquet that was offered her, but contented with coarse bread for her food, she delivered her message from Venus. Presently the box was returned to her, shut and filled with the precious commodity. Then she returned the way she came, and glad was she to come out once more into the light of day.

Bulfinch's Mythology — Part 71