Wizards or magicians have existed in every society since the beginning of times but also the victims of intolerance, often lead in modern times by the Christian Church itself.

Examples of the suppression of magical belief and practice range from the eradication of neighboring polytheistic tribes by the early Hebrews, to the attempted suppression and eventual appropriation of pagan holidays by the Catholic Church, to the mingled motives of the Conquistadors, to the Salem witch trials of the Puritans. During such periods, the tendency of magic is to become more obscure and esoteric, with a certain element in society always managing to preserve lore and tradition, often in disguised or metaphorical terms. This pattern gave rise to the term occult.
 

The word occult comes from Latin occultus (hidden), referring to the 'knowledge of the secret' or 'knowledge of the hidden' and often meaning 'knowledge of the supernatural', as opposed to 'knowledge of the visible' or 'knowledge of the measurable', usually referred to as science. The modern term's meaning is often imprecisely translated and used as a term for 'secret knowledge' or 'hidden knowledge', in the sense of meaning 'knowledge meant only for certain people' or 'knowledge that must be kept hidden'. For most practicing occultists, however, it is simply the study of a deeper spiritual reality that cannot be understood using pure reason or material science. The ancient Greek term for occult is esoteric.