The word originates from Latin substantia, literally meaning "standing under". The word was used to translate Greek philosophical term ousia.
Substance may refer to:

The Peyote Foundation - Dedicated to the protection and promotion of the peyote cactus and its sacramental use.
União do Vegetal - Personal account of a Unaio do Vegetal service from a book about spiritual uses of psychoactives by Nicholas Saunders
Web of Possibilities - Contains historical information and other resources on the use of hallucinogens for spiritual awakening and growth. Includes bibliographies on the use of hallucinogens in shamanic religions.
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