From an Orthodox Christian point of view, many diabolical beliefs and practices were associated with this feast, which have endured to this current time. On the eve of the New Year's festival, the Druids, who were the priests of the Celtic cult, instructed their people to extinguish all hearth fires and lights. On the evening of the festival they ignited a huge bonfire built from oak branches, which they believed to be sacred. Upon this fire, they offered burnt sacrifices of crops, animals, and even human beings to appease and cajole Samhain, the lord of death. They also believed that Samhain, being pleased by their faithful offerings, allowed the souls of the dead to return to homes for a festal visit on this day. This belief led to the ritual practice of wandering about in the dark dressed in costumes indicating ghosts, witches, hobgoblins, fairies and demons. The living entered into fellowship and communion with their dead by this ritual act of imitation, through costume and the wandering about in the darkness, even as the souls of the dead were believed to wander.
The dialogue of "trick-or-treat" is integral to Halloween beliefs and practices. The souls of the dead had - by Celtic tradition - entered into the world of darkness, decay, and death, and made total communion with and submission to Samhain, the lord of death. They bore the affliction of great hunger on their festal visit. This belief brought about the practice of begging as another Celtic ritual imitation of the activities of the souls of the dead on their festal visit. The implication was that any souls of the dead and their imitators who are not appeased with "treats", i.e. offerings, will provoke the wrath of Samhain, whose angels and servants (the souls and human imitators) could retaliate through a system of "tricks" or curses.
The Orthodox Christian must understand that taking part in these practices at any level is an idolatrous betrayal of our God and our Holy Faith. For if we imitate the dead by dressing up in or wandering about in the dark, or by begging with them, then we have willfully sought fellowship with the dead, whose Lord is not a Celtic Samhain, but is Satan the Evil One, who stands against God. Further, if we submit to the dialogue of "trick-or-treat," our offering goes not to innocent children, but rather to Samhain, the Lord of Death whom they have come to serve as imitators of the dead, wandering in the darkness.
We must stay away from other practices associated with Halloween, the eve of the Celtic New Year festival. The Druid priests used to instruct their faithful to extinguish their hearth fires and lights and to gather around the fire of sacrifice to make their offerings and to pay homage to the Lord of Death. This sacred fire was the fire of the new year, to be taken home to rekindle lights and hearth fires. The sacred New Year's fire developed into the practice of the Jack-o'-lantern (in the U.S.A. a pumpkin, in older days other vegetables were used), which was carved in imitation of the dead and used to convey the new light and fire to the home, where the lantern was left burning throughout the night. Even the use and display of the Jack-o'-lantern honors the Samhain, the Celtic god of death. Orthodox Christians cannot share in this Celtic activity, but must counter the secular customs by instead burning candles to the Savior, the Most Holy Mother of God, and to all the Holy Saints.
Divination was also part of this ancient Celtic festival. After the fire had died out the Druids examined the remains of the main sacrifices, hoping to foretell the coming years events. The Halloween festival was the proper night for sorcery, fortune telling, divination, games of chance, and Satan worship and witchcraft in the later Middle Ages.
In the strictly Orthodox early Celtic Church, the holy Fathers tried to counteract this pagan new year festival that honored the Lord of Death, by establishing the Feast of All Saints on the same day. (It differs in the East, where the Feast of All Saints is celebrated on the Sunday following Pentecost). The custom of the Celtic Church was for the faithful Christians to attend a vigil service and a morning celebration of the Holy Eucharist. This custom created the term Halloween. The Old English of All Hallow e'en, i.e., the eve commemorating all those who were hallowed (sanctified) became Halloween.
The remaining pagan and therefore anti-Christian people, whose paganism had become deeply intertwined with the Occult, Satanism and Magic, reacted to the Church's attempt to supplant their festival by increased fervor on this evening. The early medieval Halloween became the supreme feast of the Occult, a night and day witchcraft, demonism, sorcery and Satanism of all kinds. Many practices involved desecration and mockery of Christian practices and beliefs. Costumes of skeletons developed as a mockery of the Church's reverence for Holy Relics; Holy things were stolen, such as crosses and the Reserved Sacrament, and used perversely in sacrilegious ways. The practice of begging became a system of persecution to harass Christians who were, by their beliefs, unable to participate with offerings to those who served the Lord of Death. The Western Church's attempt failed, to supplant this pagan festival with the Feast of All Saints.
The ancient Slavic counterpart to Halloween in ancient Russia was Navy Dien' (Old Slavonic for the dead "nav"), which was also called Radunitsa and celebrated in the spring. To supplant it, the Eastern Church attached this feast to Easter, for celebration on Tuesday of Saint Thomas' Week (second week after Easter). The Church also changed the name of the feast into Radonitsa, from Russian "radost" - joy, of Easter and of the resurrection from the dead of the whole manhood of Jesus Christ. Gradually Radonitsa yielded to Easter's greater importance and became less popular. And many dark practices from old Russian pagan feasts (Semik, Kupalo, Rusalia and some aspects of the Maslennitsa) still survived till the beginning of our century. Now they are gone, but the atheist authorities used to try to reanimate them. Another "harmless" feast - May 1, proclaimed "the international worker's day" is a simple renaming the old satanic feast of Walpurgis Night (night of April 30 into the day of May 1), the yearly demonic Sabbath during which all participants united in "a fellowship of Satan".
Paganism, idolatry and Satan worship--How then did things so contradictory to the Holy Orthodox Faith gain acceptance among Christian people? The answers are spiritual apathy and listlessness, which are the spiritual roots of atheism and turning away from God. In society today, one is urged to disregard the spiritual roots and origins of secular practices when the outward practices or forms seem ordinary, entertaining, and harmless. The dogma of atheism underlies many of these practices and forms, denying the existence of both God and Satan. Practices and forms of obvious pagan and idolatrous origin are neither harmless nor of little consequence. The Holy Church stand against them because we are taught by Christ that God stands in judgment over everything we do and believe, and that our actions are either for God or against God. Therefore, the customs of Halloween are not innocent, but are demonic, precisely as their origins prove.
There are evil spirits. Demons do exist. Christ came into the world so that, through death, He might destroy him that had the dominion of death, that is, the Devil (Hebrews 2:14). Christians must see that our greatest foe is the Evil One who inspires nations and individuals to sin, and who keeps them from coming to the truth. Until we know that Satan is our real enemy, we can make little spiritual progress. For our struggle is not against flesh and blood, but against principalities, against powers, against the world rulers of the darkness of this age, against the spiritual hosts of wickedness in the heavenly places (Ephesians 6:12).
Today we witness a revival of satanist cults and special satanic ceremonies on Halloween night. Everywhere Satan reaches out to ensnare more innocent people with spiritualism, supernatural phenomena, seances, prophesies and all sorts of demonically inspired works.
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An event from the life of St John of Shanghai and San Francisco (+1966)☦️:
On November 1, the Russian Orthodox Church Outside of Russia solemnly celebrated the canonization of Father John of Kronstadt. The previous evening, Russian émigrés had decided to hold a Halloween ball at the Russian Center that night (which also happened to be Sunday eve). At the San Francisco Cathedral, many were absent during the first all-night vigil dedicated to St. John of Kronstadt, much to the Bishop's sorrow.
After the service, Bishop John went to where the ball was still going on. He ascended the steps and entered the hall, to the complete astonishment of the participants. The music stopped, and the Bishop, in complete silence, gazed intently at the speechless crowd and began to slowly walk around the hall, staff in hand. He didn't utter a word, but there was no need: a single glance from the Bishop pricked everyone's conscience, causing a general stupor, with elderly people and prominent public figures literally hiding under tables. The bishop left in silence, and the next day he issued a decree stating that all church servants who had attended a ball the previous day (including altar boys and choir singers) could not participate in the divine service the following day.
This decree prohibited participation in entertainment on the eves of Sundays and holidays.
Sacred canons dictate that Christians spend the eves of holidays in prayer and reverence, preparing for participation or presence at the Divine Liturgy. If all Orthodox Christians are called to this, then it applies even more so to those directly participating in church services. Their participation in entertainment on the eves of holidays is especially sinful. Therefore, those who attended a ball or similar entertainment and festivities on the eve of a Sunday or holiday cannot participate in the choir, serve as altar boys, enter the altar, or stand in the choir the following day.
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Anton LaVey, the founder of the Church of Satan, said:
"I am glad that Christian parents let their children worship the devil at least one night out of the year. Welcome to Halloween."