A Brāhmin is not afraid. He is not anxious, because he is dependent on God. He knows that, "I have surrendered unto God completely, and He is all-powerful. Therefore I have no anxiety." Just like a small child, he has no anxiety. Why? Because he is completely dependent on the parents. He knows confidently that in any danger, "Oh, my mother is there." As soon as he feels there is some danger, "Mother!" That's all. Finished.
Similarly, one who is completely confident that "The supreme father is there. He will protect me, give me protection," so he has no anxiety. Nārāyaṇa-parāḥ sarve na kutaścana bibhyati (SB 6.17.28). When one is fully confident about God consciousness, or Kṛṣṇa consciousness, he is not afraid, not even afraid of death, because he knows that he has no death; he is eternal.
So to come to this platform of confidence, or Kṛṣṇa consciousness, there is training. That training is called viddhi-mārga, regulative principles, following the regulative principles. So this whole varṇāśrama system, Vedic system, the different caste—Brāhmiṇ, Kṣatriya, Vaiśya, Śūdra, a brahmacārī, gṛhastha, vānaprastha, sannyāsa—they are very scientifically designed to elevate one gradually to the standard of no fear, fearfulness-less, no more fear—confident. So vipra means just the previous stage of becoming completely a Brāhmiṇ.
Janmanā jāyate śūdraḥ: "By birth everyone is born a Śūdra." Saṁskārād bhaved dvijaḥ: "When he goes to the spiritual master and the spiritual master initiates him, at that time his second birth is there, dvija." Dvija. The birds are called also dvija, because they get twice birth. Once they come as egg, the form of birth in the egg, and then, when they come out from the egg and the shell, break the shell and come out, that is real life.
Similarly, we are in the egg, within the shell of ignorance. So when we come out from the shell of ignorance, that is our second birth. The first birth is by father and mother, and the second birth is by the spiritual master and Vedic knowledge. There is also mother. The Vedic knowledge is mother, and the spiritual master is the father.
So saṁskārād bhaved dvijaḥ. The spiritual master trains the student gradually. That is called initiation. That is called dvija. Janmana jāyate śūdraḥ: "By birth by the father and mother, everyone is Śūdra." It doesn't matter where he takes his birth, not that only India they are Brāhmin, Kṣatriya, Vaiśya, Śūdra. Everywhere. Cātur-varṇyam mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ (BG 4.13). In the Bhagavad-gītā you'll find that these four system of social division—Brāhmin, Kṣatriya, Vaiśya, Śūdra—they are all over the universe, not that . . . don't think that it is in India. Everywhere.
So saṁskārād bhaved dvijaḥ. By reformation, by following the regulative principle of how to elevate oneself to the knowledge of Brahman . . . that is called saṁskāra. There are ten kinds of saṁskāras, reformatory. This Vedic system is very scientific system to elevate the humankind to the highest perfection of life. So saṁskārād bhaved dvijaḥ. Then, when the saṁskāra is given, when his . . . the spiritual master sees that "This boy is now competent to study Vedas . . ." That requires a qualification. A Śūdra is not allowed to study Vedas. There is restriction.