So guru's business is to take the torchlight of knowledge and present before the ignorant or the disciple in darkness and that gives him, relieves him from the sufferings of darkness or ignorance. This is guru's business.
Then another verse says,
- tad-vijñānārthaṁ sa gurum evābhigacchet
- samit-pāṇiḥ śrotriyaṁ brahma-niṣṭham
- (MU 1.2.12)
It is Vedic injunction. Somebody was asking whether guru is absolutely necessary. Yes, absolutely necessary. That is the Vedic injunction. The Vedas say, tad-vijñānārtham. Tad-vijñāna means spiritual knowledge. Spiritual knowledge; for acquiring spiritual knowledge. Tad-vijñānārtham. Sa—one; gurum eva—eva means must; gurum—to a guru. Must go to guru. Not "a" guru; "the" guru. Guru is one. Because as it is explained by our Revatīnandana Mahārāja, guru is coming from the disciplic succession. What five thousand years ago Vyāsadeva instructed or Kṛṣṇa instructed, the same thing we are also instructing. Therefore there is no difference between instruction. Therefore guru is one. Although hundreds and thousands of ācāryas have come and gone, but the message is one. Therefore guru cannot be two. Real guru will not talk differently. Some guru says that "In my opinion, you should like this," and some guru will say, "In my opinion you'll do this"—they are not guru; they are all rascals. Guru has no "own" opinion. Guru has got only one opinion, the same opinion which was expressed by Kṛṣṇa, Vyāsadeva or Nārada or Arjuna or Śrī Caitanya Mahāprabhu or the Gosvāmīs. You'll find the same thing. Five thousand years ago, Lord Śrī Kṛṣṇa spoke Bhagavad-gītā and Vyāsadeva wrote it, recorded it. Vyāsadeva does not say that "It is my opinion." Vyāsadeva writes, śrī bhagavān uvāca: "Whatever writing, it is spoken by the Supreme Personality of Godhead." He's not giving his own opinion. Śrī bhagavān uvāca. Therefore he is guru. He is not misinterpreting the words of Kṛṣṇa. He's giving as it is. Just like a bearer, peon. Somebody has written you letter, the peon has got the letter. It does not mean he has to correct it or edit it or addition or... No. He'll present it. That is his duty. Then he is guru. He's honest. Similarly, guru cannot be two. Mind that. The person may be different, but the message is the same. Therefore guru is one.