Therefore, a person who seriously desires to inquire about the ultimate transcendental benefit must take shelter of a bona fide guru. The qualifications of śrī guru are that (1) he has fully realized the purport of all Vedic scriptures (śabda-brahma), (2) has full realization of the Supreme Absolute Truth (Parabrahma Śrī Kṛṣṇa) and (3) is completely free from material desires and attachments.

Slokamrtam-bindu - Śrīla Gurudeva_2ed_2012