This is not very difficult. Just like you are working in office. If your immediate officer, boss, is pleased, that means the proprietor of the firm, he's also pleased, although you do not see him. This is fact. Your immediate boss, if he's pleased. So similarly, we, our business, this spiritual line, is guru-kṛṣṇa-kṛpā.
We have to first receive the merciful benediction from the ācārya, and then Kṛṣṇa will be pleased and He'll also give His blessings. Mad-bhakta. There is a version in the Śrīmad-Bhāgavatam, mad-bhakta pūjyābhyadhikā. He says, Kṛṣṇa says, that "If anyone worships Me directly and if anyone worships Me through the ācārya, he's better devotee who is coming to Me through ācārya." Mad-bhakta pūjyābhyadhikā.
So our this Vaiṣṇava philosophy, process, is go through the ācārya. Servant of the servant of the servant. We should try to become servant of the servant. Gopī-bhartuḥ pada-kamalayor dāsa-dāsānudāsaḥ (CC Madhya 13.80). Dāsa-dāsānudāsaḥ. We should not approach the Supreme Personality of Godhead directly. That is not good.
That will not be . . . in the Vedic injunction also it is said, yasya deve parā bhaktir yathā deve tathā gurau (ŚU 6.23): if one has got unflinching faith in the Supreme Personality of Godhead, yathā deve, and similar faith in guru . . .
Of course, we must make guru bona fide. Then it is disciplic succession. And that is also not very difficult to select, who is bona fide guru. Bona fide guru means he presents himself as servant of God. He does not pose himself falsely that "I am God." This is bona fide. It is not difficult to find out bona fide. But this is the test.
If anyone says that, "I am guru . . ." er, "I am God," then he cannot be guru, because he has no knowledge. How he is God? But he can cheat some people. That is different thing. You can cheat all people for some time and some people for all time, but not all people for all time. That is not possible.