Note 12 — Book I.--Brahman, the Sum and Substance of Everything
Reading edition
That is, those who have been invested with the sacred thread, which is a sign of having been initiated into the paternal caste. This ceremony takes place at the age of seven or nine years, but is only observed by the three higher castes. It is to be compared with the Christian rites of baptism and confirmation. Hindu boys, when invested with the sacred thread or cord, are said to be born again.