The Greeks were the first to evolve truly rational methods of treating the sick. Both the Greeks and the Egyptians received their medical knowledge from the Euphrates valley. Oil and wine was a very early medicine for treating wounds; castor oil and opium were used by the Sumerians. Many of these ancient and effective secret remedies lost their power when they became known; secrecy has always been essential to the successful practice of fraud and superstition. Only facts and truth court the full light of comprehension and rejoice in the illumination and enlightenment of scientific research.

The essence of the ritual is the perfection of its performance; among savages it must be practiced with exact precision. It is only when the ritual has been correctly carried out that the ceremony possesses compelling power over the spirits. If the ritual is faulty, it only arouses the anger and resentment of the gods. Therefore, since man's slowly evolving mind conceived that the technique of ritual was the decisive factor in its efficacy, it was inevitable that the early shamans should sooner or later evolve into a priesthood trained to direct the meticulous practice of the ritual. And so for tens of thousands of years endless rituals have hampered society and cursed civilization, have been an intolerable burden to every act of life, every racial undertaking.

Ritual is the technique of sanctifying custom; ritual creates and perpetuates myths as well as contributing to the preservation of social and religious customs. Again, ritual itself has been fathered by myths. Rituals are often at first social, later becoming economic and finally acquiring the sanctity and dignity of religious ceremonial. Ritual may be personal or group in practice—or both—as illustrated by prayer, dancing, and drama.

Words become a part of ritual, such as the use of terms like amen and selah. The habit of swearing, profanity, represents a prostitution of former ritualistic repetition of holy names. The making of pilgrimages to sacred shrines is a very ancient ritual. The ritual next grew into elaborate ceremonies of purification, cleansing, and sanctification. The initiation ceremonies of the primitive tribal secret societies were in reality a crude religious rite. The worship technique of the olden mystery cults was just one long performance of accumulated religious ritual. Ritual finally developed into the modern types of social ceremonials and religious worship, services embracing prayer, song, responsive reading, and other individual and group spiritual devotions.

The priests evolved from shamans up through oracles, diviners, singers, dancers, weathermakers, guardians of religious relics, temple custodians, and foretellers of events, to the status of actual directors of religious worship. Eventually the office became hereditary; a continuous priestly caste arose.

As religion evolved, priests began to specialize according to their innate talents or special predilections. Some became singers, others prayers, and still others sacrificers; later came the orators—preachers. And when religion became institutionalized, these priests claimed to “hold the keys of heaven.”

The priests have always sought to impress and awe the common people by conducting the religious ritual in an ancient tongue and by sundry magical passes so to mystify the worshipers as to enhance their own piety and authority. The great danger in all this is that the ritual tends to become a substitute for religion.