Later mantras had been applied more to guard the spiritual lifetime of the chanter, and sections on mantras started to be A part of some Mahayana sutras such as the White Lotus Sutra, and also the Lankavatara Sutra. The scope of security also improved With this time. From the Sutra https://baglamukhi-shabar-mantra94826.tkzblog.com/32466001/top-mantra-secrets