If the guru is not in his proper way according to śāstra... Guru means he must be abiding by the rules and regulation of the śāstra. Sādhu-guru-śāstra. Sādhu means one who is obeying the rules and regulation of śāstra. Śāstra must be the medium. Without śāstra nothing is acceptable. That is spoken by Kṛṣṇa. Tasmād śāstra-vidhānoktaḥ. Yaḥ śāstra-vidhim utsṛjya vartate kāma-kārataḥ (BG 16.23). So nobody can transgress the rules and regulation of śāstra, and what to speak of a guru. Guru is ācārya. Acinoti yaḥ śāstrāṇi. One who knows the rules and regulation of the śāstra and he teaches his disciple according to the śāstra, he is called ācārya. So ācāryaṁ māṁ vijānīyān nāvamanyeta karhicit (SB 11.17.27). Ācārya should be respected, as Kṛṣṇa says, as good as Kṛṣṇa. Viśvanātha Cakravartī Ṭhākura also said, sākṣād-dharitvena samasta-śāstrair uktas tathā bhāvyata eva sadbhiḥ **. Ācārya, guru, is as good as God. Sākṣād-dharitvena. Ācārya should be respected as Kṛṣṇa. Therefore ācāryaṁ māṁ vijānīyān nāvamanyeta karhicit (SB 11.17.27). If somebody foolishly thinks that "They are worshiping a man. He's like me, and he has taken the seat, and he's taking worship, respect, from disciples." Sometimes they question like that. But they do not know that how ācārya should be respected. Ācārya should be respected sākṣād-dharitvena, just like God. It is not exaggeration. It is according to the śāstra. And ācārya also accepts all these respectful obeisances to carry to the Supreme Personality of Godhead. This is the process. As we receive knowledge from the ācārya, similarly, our activities, the result of activities, is carried by the ācārya to the Supreme Personality of Godhead. Ācārya does not accept anything on his own account. Ācārya accepts everything on Kṛṣṇa's account. That is the principle. And because he is representative of Kṛṣṇa, he is dealing on behalf of Kṛṣṇa.
We have got in practical experience. Formerly, in British government, there was viceroy. Vice means in place of and roy means royal king. Viceroy. So this viceroy was respected as the king, as the emperor. That is the process. When he's no longer a viceroy, then he's not respected. But so long he is acting as viceroy... And the rule was that whatever presentation was given to the viceroy he did not accept it personally. It was kept in the state. So these are the process. So guru, ācārya, being representative of the Supreme Personality of Godhead, he should be worshiped. Nāvamanyeta... Na martya-buddhyāsūyeta. Never think of envying. As soon as we become envious of the ācārya, there is falldown, immediately. Yasyāprasādān na gatiḥ kuto 'pi. Yasya prasādād bhagavat-prasādaḥ **. This is the teaching of Viśvanātha Cakravartī Ṭhākura. He's also ācārya. Ācārya-paramparā.