Hesiod, The Homeric Hymns, and Homerica
Page: 86(ll. 434-437) So did they turn, with hearts at one, greatly cheer each the other's soul and spirit with many an embrace: their heart had relief from their griefs while each took and gave back joyousness.
(ll. 441-459) And all-seeing Zeus sent a messenger to them, rich-haired Rhea, to bring dark-cloaked Demeter to join the families of the gods: and he promised to give her what right she should choose among the deathless gods and agreed that her daughter should go down for the third part of the circling year to darkness and gloom, but for the two parts should live with her mother and the other deathless gods. Thus he commanded. And the goddess did not disobey the message of Zeus; swiftly she rushed down from the peaks of Olympus and came to the plain of Rharus, rich, fertile corn-land once, but then in nowise fruitful, for it lay idle and utterly leafless, because the white grain was hidden by design of trim-ankled Demeter. But afterwards, as springtime waxed, it was soon to be waving with long ears of corn, and its rich furrows to be loaded with grain upon the ground, while others would already be bound in sheaves. There first she landed from the fruitless upper air: and glad were the goddesses to see each other and cheered in heart. Then bright-coiffed Rhea said to Demeter:
(ll. 460-469) 'Come, my daughter; for far-seeing Zeus the loud-thunderer calls you to join the families of the gods, and has promised to give you what rights you please among the deathless gods, and has agreed that for a third part of the circling year your daughter shall go down to darkness and gloom, but for the two parts shall be with you and the other deathless gods: so has he declared it shall be and has bowed his head in token. But come, my child, obey, and be not too angry unrelentingly with the dark-clouded Son of Cronos; but rather increase forthwith for men the fruit that gives them life.'
(ll. 470-482) So spake Rhea. And rich-crowned Demeter did not refuse but straightway made fruit to spring up from the rich lands, so that the whole wide earth was laden with leaves and flowers. Then she went, and to the kings who deal justice, Triptolemus and Diocles, the horse-driver, and to doughty Eumolpus and Celeus, leader of the people, she showed the conduct of her rites and taught them all her mysteries, to Triptolemus and Polyxeinus and Diocles also,—awful mysteries which no one may in any way transgress or pry into or utter, for deep awe of the gods checks the voice. Happy is he among men upon earth who has seen these mysteries; but he who is uninitiate and who has no part in them, never has lot of like good things once he is dead, down in the darkness and gloom.