So śrutayo vibhinnāḥ. Scriptures are different. Arguments, that is also not helpful. One man may argue better than me. Then philosophy: The philosophy, it is said, nāsau munir yasya mataṁ na bhinnam (CC Madhya 17.186). One philosopher is differing from another philosopher. Just now today Śyāmasundara has purchased one book about different philosophers. So that, you also cannot ascertain what is truth. Therefore śāstra says, dharmasya tattvaṁ nihitaṁ guhāyām. The truth is very confidential. So if you want to know that truth, mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186), you should have to follow the great ācāryas. Then you will understand.
Therefore ācārya-upāsanā is essential. Ācārya-upāsanā is very essential. In all the Vedic śāstras the injunction is that. Tad-vijñānārthaṁ sa gurum evābhigacchet, śrotriyaṁ brahma-niṣṭham (MU 1.2.12). Tasmād gurum prapadyeta jijñāsuḥ śreya uttamam (SB 11.3.21). Anyone who is inquisitive to understand higher truths, he must surrender to guru. Tasmād guruṁ prapadyeta, jijñāsuḥ śreya uttamam. One who is inquisitive, who is now inquiring about transcendental subject matter, tad viddhi praṇipātena paripraśnena sevayā (BG 4.34). So all the śāstras says, in our Vaiṣṇava śāstra also Rūpa Gosvāmī says, ādau gurv-āśrayam: "In the first beginning, you must take shelter of a bona fide guru."