Śrīla Prabhupāda on Vyāsa-pūjā
ācāryavān puruṣo veda. Anyone who is following ācārya, whatever he says it is correct. Because he does not manufacture. He says what he has heard from the ācāryas exactly like the child, what he has heard from his father, from the superior, he speaks.
So that is the position of guru. Guru is respected as good as God. Why? Only for this qualification, that he does not speak anything nonsense. He speaks only what he has heard from the ācārya. Ācāryavān puruṣo veda. Ācāryopāsanam. In the Bhagavad-gītā it is said ācāryopāsanam. So Vyāsadeva is our ācārya, therefore we offer vyāsa-pūjā. On the birthday of guru we offer vyāsa-pūjā. Actually, it is not directly Vyāsa, but because the bona fide guru represents Vyāsadeva, his pūjā is also vyāsa-pūjā. Mad-bhakta-pūjā abhyadhikā. To worship Vyāsadeva, worship the bona fide spiritual master and worship the Lord, they are the same.
Śrīmad-Bhāgavatam 1.7.5 -- Vṛndāvana, September 4, 1976