This document discusses mystical and altered states of consciousness. It describes key features of mystical experiences, including unity, transcendence of time and space, and ineffability. Methods that have been used historically and cross-culturally to induce mystical states are outlined, such as meditation, sensory deprivation/overload, fasting, and psychedelic substances. Research is presented showing psychedelics like psilocybin can occasion experiences meeting definitions of mysticism and can have lasting positive effects. The potential therapeutic value of inducing mystical states is discussed.