Happy is he among men upon earth who has seen these mysteries; but he
who is uninitiated and who has no part in them never has lot of like good
things once he is dead, down in the darkness and gloom.
Happy is he who, having seen these rites, goes below the hollow earth;
for he knows the end of life and he knows its god-sent beginning.
It was the common belief in Athens that whoever had been taught the
Mysteries would, when he died, be deemed worthy of divine glory.
Hence all were eager for initiation.
I purposed to pursue the subject, and describe all the objects that admit of description in the sanctuary at Athens called the Eleusinian, but I was prevented from so doing by a vision in a dream. I will, therefore, turn to what may be lawfully told to everybody.
Pausanius, I, 14, 3 (translation by Frazer)
My dream forbade me to describe what is within the wall of the sanctuary; and surely it is clear that the uninitiated may not lawfully hear of that from the sight of which they are debarred.
Pausanius, I, 38, 7 (translation by Frazer)
And the synthema (password) of the Eleusinian mysteries is as follows:
‘I fasted; I drank the kykeon; I took out of the chest; having done my
task, I put again into the basket, and from the basket again into the chest.’
Aristotle maintains that it is not necessary for the initiated to learn
anything, but to receive impressions and to be put in a certain frame of
mind by becoming worthy candidates.