The word used by Early Christians to indicate the Christian Mystery is μυστήριον (mysterion). The Old Testament versions use the word mysterion as an equivalent for the Hebrew sôd, "secret" (Proverbs 20:19; Judith 2:2; Sirach 22:27; 2 Maccabees 13:21). In the New Testament the word mystery is applied ordinarily to the sublime revelation of the Gospel (Matthew 13:11; Colossians 2:2; 1 Timothy 3:9; 1 Corinthians 15:51), and to the Incarnation and life of the Saviour and His manifestation by the preaching of the Apostles (Romans 16:25; Ephesians 3:4; 6:19; Colossians 1:26; 4:3). Theologians give the name mystery to revealed truths that surpass the powers of natural reason, so, in a narrow sense, the Mystery is a truth that transcends the created intellect. The impossibility of obtaining a rational comprehension of the Mystery leads to an inner or hidden way of comprehension of the Christian Mystery which is indicated by the term esoteric in Esoteric Christianity.
Even though revealed and believed, the Mystery remains nevertheless obscure and veiled during the mortal life, if the deciphering of the mysteries, made possible by esotericism, does not intervene.
This esoteric knowledge would allow a deep comprehension of the Christian mysteries which otherwise would remain obscure.
Some modern scholars believe that in the early stages of Christianity a nucleus of oral teachings were inherited from Palestinian and Hellenistic Judaism which formed the basis of a secret oral tradition, which in the 4th century came to be called the disciplina arcani. Important influences on Esoteric Christianity are the Christian theologians Clement of Alexandria and Origen, the main figures of the Catechetical School of Alexandria.
Origen was a most prolific writer - according to Epiphanius, he wrote about 6,000 books - making it a difficult task to define the central core of his teachings. The original Greek text of his main theological work De Principiis only survives in fragments, while a 5th century Latin translation was cleared of controversial teachings by the translator Rufinus, making it hard for modern scholars to rebuild Origen's original thoughts. Thus, it is unclear whether reincarnation and the pre-existence of souls formed part of Origen's beliefs.
While hypothetically considering a complex multiple-world transmigration scheme in De Principiis, Origen denies reincarnation in unmistakable terms in his work, Against Celsus and elsewhere.
Despite this apparent contradiction, most modern Esoteric Christian movements refer to Origen's writings (along, with other Church Fathers and biblical passages) to validate these ideas as part of the Esoteric Christian tradition.
In the later Middle Ages forms of Western esotericism, for example alchemy and astrology, were constructed on Christian foundations, combining Christian theology and doctrines with esoteric concepts.
Giovanni Pico della Mirandola's Apologia ("Apologia J. Pici Mirandolani, Concordiae comitis" published in 1489) states that there are two types of "magic", which are theurgy (divine magic), and goetia (demonic magic). These disciplines were explained as the "Operation of the Stars", just as alchemy was the "Operation of the Sun", and astrology the "Operation of the Moon." Kabbalah was also an active discipline. Esoteric Christian practitioners might practice these forms or traditions, which made them adepts, alchemists, astrologists, and Hermetic Qabalists, while still being Esoteric Christian practitioners of a passive discipline which helped them better use the "mystery knowledge" they gained from the elite, or Higher Beings.
In the 17th century this was followed up by the development of Theosophy and Rosicrucianism. The Behmenist movements also developed around this time. In the 18th century, Freemasonry came about.
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