Sukadeva Gosvami is explaining how to become perfect gentleman. That is culture. If we do not accept education, culture, then where is the difference between a man and dog? There is no difference. So the Vedic civilization means
everything under rules and regulation. That is Vedic civilization. Animal cannot be brought under rules and regulations. That is not possible.
Therefore that is the speciality of human society, that the more one society follows the rules and regulation, he is to be considered civilized. Just like throughout the whole history there are civilization, Aryan civilization, Aryan and non-Aryan. What is the difference? Aryan means progress. One who is progressing towards the perfection of life, they are called Aryans, and those who are degrading towards animal propensity, they are non-Aryans. This is the difference. Aryan culture.
So Krsna, when found Arjuna, that he was in the battlefield and Krsna Himself is guiding him and becoming the chariot driver, and He saw that "Arjuna is declining to fight?" He became surprised. So He chastised him, kutas te kasmalam idam visame samupasthitam anarya-justam. Aryan, arya, arya. "So this is not for a gentleman, business. You are behaving like non-Aryans." Non-Aryan. So this is the difference between culture and nonculture, that...
There is a Bengali proverb that one girl was to dance on the stage. So in Indian civilization the girls or the woman, they cover their head with..., from superiors. So naste vase guntala(?). She has gone to dance on the stage, and she is pulling on the veil. "Now, where is the opportunity of here to become a household wife? You have come to dance."
So similarly, Arjuna was chastised that "You have come to
fight, and now you are becoming very nonviolent,
atheist..., er, theist. What is...? So this is anarya. You have to do your duty in proper place." That is Aryanism. That is arya. Arya-samaj means one who knows his duty, how to do it in proper time. So ksatriya, his duty is to fight, to defend from the hands of the enemy. So he was declining to fight, so He chastised him, "Non-Aryans. You are not Aryan.
So here Sukadeva Gosvami says, "My dear king, if a diseased person eats the pure, uncontaminated food prescribed by a physician, he is gradually cured, and the
infection of disease can no longer touch him.
Similarly, if one follows the regulative principles of knowledge, he gradually progresses towards liberation from material contamination.
>>> Ref. VedaBase => Srimad-Bhagavatam 6.1.12 -- Honolulu, May 13, 1976