Parshanut do Liczb 6:33

He shall bring himself. The time limit for a vow of nezirus was not mentioned in the Torah, because the main point of nezirus is to “set himself apart for Hashem,” which means to remove himself from physical desires, arrogance, and luxuries. Such a thing has no time limit. Each person needs to appraise himself as to the amount of time he needs to reign in his urges, whether 30 or 100 days, according to his nature. The test of whether he has reached completion, and his urges will not hold sway over him, is when he looks at his own affairs like someone looking at someone else’s actions, and he is not preoccupied with self-love. At such a level, one can be assured that he will only benefit from worldly pleasures in the proper amount and he will not be drawn after luxuries. On the contrary, he will have pleasure in this world and will have positive interactions with other people. Therefore, the Torah uses a language of “he shall bring himself” as if he were bringing another man. One should view his own affairs with the same perspective he views another man’s virtues and weighs him on the scales of justice.