The meaning of spirituality has developed and expanded over time, and various connotations can be found alongside each other.^[1][2][3]1

Traditionally, spirituality referred to a religious process of re-formation which “aims to recover the original shape of man”,² oriented at “the image of God”^[4][5] as exemplified by the founders and sacred texts of the religions of the world. The term was used within early Christianity to refer to a life oriented toward the Holy Spirit^[6] and broadened during late medieval times to include mental aspects of life.

In modern times the term both spread to other religious traditions^[7] and broadened to refer to a wider range of experience, including a range of esoteric traditions and religious traditions. Modern usages tend to refer to a subjective experience of a sacred dimension^[8] and the “deepest values and meanings by which people live”,^[9][10] often in a context separate from organized religious institutions,^[11] such as a belief in a supernatural (beyond the known and observable) realm,^[12] personal growth,^[13] a quest for an ultimate or sacred meaning,^[14] religious experience,^[15] or an encounter with one’s own “inner dimension”.^[16]