One of the seven churches mentioned in the Christian book of Revelation.
"When the Kundalini has risen to the region of the larynx it grants the power of hearing the voices of those beings that live in the supra-sensible worlds. The Church of Sardis is in the chakra of the larynx; this chakra has sixteen petals. When the Kundalini reaches this height, it flourishes upon our fertile lips made verb." - Samael Aun Weor, The Yellow Book