ṣaṭ-karma-nipuṇo vipro mantra-tantra-viśāradaḥ avaiṣṇavo gurur na syād vaiṣṇavaḥ śva-paco guruḥ “A scholarly brāhmaṇa, expert in all subjects of Vedic knowledge, is unfit to become a spiritual master without being a Vaiṣṇava, or expert in the science of Kṛṣṇa consciousness. But a person born in a family of a lower caste can become a spiritual master if he is a Vaiṣṇava, or Kṛṣṇa conscious.” ( Padma Purāṇa)
