The six syllables of Truth or Six-syllable Mantra of Great Illumination
from the Buddhist esoteric school are om mani padme hum. The
mantra is to be chanted without having to unravel its mystery. The
chanter focuses in mind, congeals and gathers thinking, allows
differentiation and false thoughts to arise no more, and reaches the
goal of samadhi.
The six syllables of Truth together, as expounded, are about shiny
pearl and blooming lotus, and reciting them effectuates concentration
of resolve. Atop that, reciting the six syllables of Truth—like namo
Amitabha, which Pureland sect practitioners hold to and chant—
effectuates purification of own faculty of mind and produces stellar
results in the pursuit of Pureland rebirth.