Qualification of brāhmaṇa can be fully attained if one becomes Vaiṣṇava. Vaiṣṇava is transcendental even to the brāhmaṇa. Sa guṇān samatītyaitān brahma-bhūyāya kalpate (BG 14.26). He becomes transcendental to the stage of all the three modes of material nature. There are three modes of material nature: sattva-guṇa, rajo-guṇa, tamo-guṇa. Sattva-guṇa is the stage of brāhmaṇa, rajo-guṇa is the stage of kṣatriya, and tamo-guṇa is the stage of śūdra, and mixed together is the stage of vaiśya. Vaiśya has mixed quality; and pure sattva-guṇa, brāhmaṇa; pure rajo-guṇa, kṣatriya.
So Kṛṣṇa says . . . Kṛṣṇa did not say Bhagavad-gītā to the loafer class. Kṛṣṇa said rājarṣi. Arjuna was a rājarṣi. So there are . . . because king would take responsibility. If the head man is taught very nicely everything about society, economic development and religion, if he is taught very nicely, then he can, I mean to say, introduce the ideas in the country. Therefore there was monarchy. The king would learn from the brāhmaṇas how to rule over the citizens. That was perfect. Imaṁ rājarṣayo viduḥ. Rāja and ṛṣi. Or rāja means king and ṛṣi means saintly person. So either the ṛṣis did know or the kings did know. Or a king who is not less than a ṛṣi, he could know and he could rule over. That is the Vedic injunction. Imaṁ rājarṣayo viduḥ. But without being rājarṣi, without being highly qualified, nobody can understand.