The Concise Oxford Dictionary of World Religions (1671 page)

) under the guidance of a
guru
, involves a long process of purification,
Ha
ha
, and
Ku
alin
yoga which creates a ripe (
pakva
) body out of an unripe (
apakva
) one.
An oral tradition of songs in the vernaculars, especially Bengali and Hind
, praises the N
th saints, and a written literature in Skt. describes yoga practice. Gorakhn
th is credited with writing the
Ha
ha Yoga
, now lost, and the
Gorak
a Sataka
. Other important texts of the N
ths are the
iva
Sa
hit
, the
Gheranda Sa
hit