PLATO

Demeter is who gives food like a mother (Plato Cratylus 404c)

I envy you, Callicles, for having been initiated into the great mysteries before you were initiated into the lesser. I thought that this was not allowable. (Plato Gorgias 497)

The founders of the mysteries would appear to have had a real meaning, and were not talking nonsense when they intimated in a figure long ago that he who passes unsanctified and uninitiated into the world below will lie in a slough, but that he who arrives there after initiation and purification will dwell with the gods. For ‘many,’ as they say in the mysteries, ‘are the thyrsus-bearers, but few are the mystics,’ – meaning, as I interpret the words, ‘the true philosophers.’ (Plato Phaedo, 69)

There comes into my mind an ancient doctrine which affirms that they go from hence into the other world, and returning here, are born again from the dead. Now if it be true that the living come from the dead, then our souls must exist in the other world, for if not, how could they have been born again?…Then let us consider the whole question, not in relation to man only, but in relation to animals generally, and to plants, and to everything of which there is generation, and the proof will be easier. (Plato Phaedo, 70)

That soul, I say, herself invisible, departs to the invisible world – to the divine and immortal and rational: There arriving, she is secure of bliss and is released from the error and folly of men, their fears and wild passions and all other human ills, and forever dwells, as they say of the initiated, in company with the gods. (Plato Phaedo, 81)

There was a time when with the rest of the happy band they saw beauty shining
in brightness, – we philosophers following in the train of Zeus, others in company with other gods; and then we beheld the beatific vision and were initiated into a mystery which may be truly called most blessed, celebrated by us in our state of innocence before we had any experience of evils to come, when we were admitted to the sight of apparitions innocent and simple and calm and happy, which we beheld shining in pure light. (Plato, Phaedrus, 250)

But if There is an absolute necessity for their mention, a chosen few might hear them in a mystery, and they should sacrifice not a common (Eleusinian) pig, but some huge and unprocurable victim; and then the number of the hearers will be very few indeed. (Plato, Republic II, 378)