Guru is therefore external manifestation of Kṛṣṇa because he acts as representative of Kṛṣṇa. So what is the qualification of that guru? Tasmād guruṁ prapadyeta (SB 11.3.21). You must go and surrender to guru. In the Vedas also it is said, tasmād guruṁ prapadyeta jijñāsuḥ śreya uttamam. For whom guru is required? Not for all. But tad-vijñānārthaṁ sa gurum eva abhigacchet (MU 1.2.12). One should go to guru to understand tad-vijñāna. Tad-vijñāna means transcendental science. They require guru. Similarly, in the Śrīmad-Bhāgavatam it is said, tasmād guruṁ prapadyeta: "You should go and search out a guru and surrender unto him." Why? Jijñāsuḥ śreya uttamam. If you are jijñāsuḥ . . . athāto brahma jijñāsā—Vedānta-sūtra—if you are actually searching after the Absolute Truth.
So the next question will be, "Then whom shall I select guru?" Now, śābde pare ca niṣṇātam. A guru means one who is fully conversant in Vedic knowledge. Śābde pare. Śabda-brahman. Veda is known as śabda-brahman. In the material world all these books are material sound vibration, but Vedic knowledge is transcendental sound vibration. Hare Kṛṣṇa is transcendental sound vibration. Narottama dāsa Ṭhākura says, golokera prema-dhana, hari-nāma-saṅkīrtana. This hari-nāma-saṅkīrtana is not a cinema song. No. It is golokera prema-dhana. This sound is coming . . . just like we catch sound in the radios and television, similarly, you can catch sound also which is transmitted from Goloka Vṛndāvana. But you must have the particular machine to catch it. Then you can get message from Goloka Vṛndāvana.