Within Caodaism, spirit mediums and séances occupy a foundational place as the principal channel through which the divine world discloses itself to the human community. Mediums serve as intermediaries between the physical and spiritual realms, believed to be chosen by higher powers and expected to maintain ritual purity and disciplined conduct. Through them, messages are received from Cao Đài, from deities and Buddhas, and from revered sages such as Confucius and Jesus Christ, as well as other elevated spirits. These communications are not treated as casual inspirations but as authoritative teachings that shape belief and practice.

Séances, conducted with formal ritual care, provide the structured setting for this communication. They typically involve prayers, incense, and specific ceremonial protocols, and often employ forms of automatic or planchette writing through which spirits convey their messages. The content of these messages ranges from religious doctrine and moral exhortation to guidance on the internal organization and administration of the faith. In this way, séances have supplied much of the material that later becomes embedded in Caodaist scripture, liturgy, and institutional life.

From a spiritual perspective, this mediumistic dimension gives Caodaism a distinctive character as a tradition that institutionalizes direct contact with the unseen. The hierarchy of the religion looks to séance communications when discerning major religious decisions, so that spiritual revelation and organizational development are closely intertwined. For practitioners, this means that ethical instruction, communal direction, and theological clarification are experienced not merely as inherited teachings, but as living messages continually flowing from the spirit world.