What does "Kadosh Hu ... " mean here?
Rashi: It means that the Nazir is holy, which is why he is not allowed to become Tamei Mes.
Seforno: It elevates him to a higher plane, rendering him fit to issue rulings like leaders of the generation. 1
Seforno: Which is why Elkanah was happy to give his consent, when the angel instructed his wife Chanah, to declare his son Shmuel a Nazir from birth - See Shmuel 1:23.