Self-restraint (Saṃyamaobservance of ascetic conduct)-
1. Check the Karma abstinence from the causes of influx of Karma, karmādānakāraṇanivṛttiścāritram.
(Ta Vā 1.7)
carittena niginhāi
(U 28.35)
2. The Yoga (2) (activities of mind, speech and body) which is free from sin;
it results in Nirjarā (shedding Karma) - the collection of Karma gradually becomes empty.
.... eyam cayarittalcaram, cārittam hoi āhiyam..
(U 28.33)