The Initiate was prepared to receive the great lessons of all the Mysteries, by long trials, or by abstinence and chastity. For many days he was required to fast and be continent, and to drink liquids calculated to diminish his passions and keep him chaste.

Ablutions were also required, symbolical of the purity necessary to enable the soul to escape from its bondage in matter. Sacred baths and preparatory baptisms were used, lustrations, immersions, lustral sprinklings, and purifications of every kind. At Athens they bathed in the Ilissus, which thence became a sacred river; and before entering the Temple of Eleusis, all were required to wash their hands in a vase of lustral water placed near the entrance. Clean hands and a pure heart were required of the candidates. Apuleius bathed seven times in the sea, symbolical of the Seven Spheres through which the Soul must reascend: and the Hindus must bathe in the sacred river Ganges.

Clemens of Alexandria cites a passage of Menander, who speaks of a purification by sprinkling three times with salt and water. Sulphur, resin, and the laurel also served for purification, as did air, earth, water, and fire. The Initiates at Heliopolis, in Syria, says Lucian, sacrificed the sacred lamb, symbol of Aries, then the sign of the Vernal Equinox; ate his flesh, as the Israelites did at the Passover; and then touched his head and feet to theirs, and knelt upon the fleece. Then they bathed in warm water, drank of the same, and slept upon the ground.

There was a distinction between the lesser and greater Mysteries. One must have been for some years admitted to the former before he could receive the latter, which were but a preparation for them, the Vestibule of the Temple, of which those of Eleusis were the Sanctuary. There, in the lesser Mysteries, they were prepared to receive the holy truths taught in the greater. The Initiates in the lesser were called simply Mystes, or Initiates; but those in the greater, Epoptes, or Seers. An ancient poet says that the former were an imperfect shadow of the latter, as sleep is of Death. After admission to the former, the Initiate was taught lessons of morality, and the rudiments of the sacred science, the most sublime and secret part of which was reserved for the Epopt, who saw the Truth in its nakedness, while the Mystes only viewed it through a veil and under emblems fitter to excite than to satisfy his curiosity.

Before communicating the first secrets and primary dogmas of initiation, the priests required the candidate to take a fearful oath never to divulge the secrets. Then he made his vows, prayers, and sacrifices to the Gods. The skins of the victims consecrated to Jupiter were spread on the ground, and he was made to set his feet upon them. He was then taught some enigmatic formulas, as answers to questions, by which to make himself known. He was then enthroned, invested with a purple cincture, and crowned with flowers, or branches of palm or olive.

We do not certainly know the time that was required to elapse between the admission to the Lesser and Greater Mysteries of Eleusis. Most writers fix it at five years. It was a singular mark of favor when Demetrius was made Mystes and Epopt in one and the same ceremony. When at length admitted to the Degree of Perfection, the Initiate was brought face to face with entire nature, and learned that the soul was the whole of man: that earth was but his place of exile; that Heaven was his native country; that for the soul to be born is really to die; and that death was for it the return to a new life. Then he entered the sanctuary; but he did not receive the whole instruction at once. It continued through several years. There were, as it were, many apartments, through which he advanced by degrees, and between which thick veils intervened. There were Statues and Paintings, says Proclus, in the inmost sanctuary, showing the forms assumed by the Gods, finally the last veil fell, the sacred covering dropped from the image of the Goddess, and she stood revealed in all her splendor, surrounded by a divine light, which, filling the whole sanctuary, dazzled the eyes and penetrated the soul of the Initiate. Thus is symbolized the final revelation of the true doctrine as to the nature of Deity and of the soul, and of the relations of each to matter.

This was preceded by frightful scenes, alternations of fear and joy, of light and darkness; by glittering lightning and the crash of thunder, and apparitions of spectres, or magical illusions, impressing at once the eyes and ears. This Claudian describes, in his poem on the rape of Proserpine, where he alludes to what passed in her Mysteries. "The temple is shaken," he cries; "fiercely gleams the lightning, by which the Deity announces his presence. Earth trembles; and a terrible noise is heard in the midst of these terrors. The Temple of the Son of Cecrops resounds with long-continued roars; Eleusis uplifts her sacred torches; the serpents of Triptolemus are heard to hiss; and fearful Hecate appears afar."

The celebration of the Greek Mysteries continued, according to the better opinion, for nine days.

On the first the Initiates met. It was the day of the full moon, of the month Boëdromion; when the moon was full at the end of the sign Aries, near the Pleiades and the place of her exaltation in Taurus.

The second day there was a procession to the sea, for purification by bathing.