Srila Prabhupada's glance
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"Narottama dasa Thakura says, sadhu-sastra-guru-vakya, cittete kariya aikya: 'One should accept as one's guide the words of the sadhus, the sastra and the guru.' A sadhu is a great personality like Sri Caitanya Mahaprabhu, the sastras are the injunctions of revealed scriptures, and the guru, or spiritual master, is one who confirms the scriptural injunctions. Accepting the guidance of these three is the actual way of following the great personalities (mahajanas) for real advancement in life (mahajano yena gatah sa panthah). A man covered by illusion cannot understand the proper way; therefore Sri Caitanya Mahaprabhu says, dharma-sthapana-hetu sadhura vyavahara: 'The behavior of a devotee is the criterion for all other behavior.'"
(Sri Caitanya-caritamrita, Madhya 17.185, Purport)
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