Mantra Thirteen
65
MANTRA THIRTEEN
अन्यदेवाङ्ः सम्भवादन्यदादुरसम्भवात् । इति शुश्रुम धीराणां ये नस्तद्विचचक्षिरे ॥ १३ ॥
anyad evāhuḥ sambhavād anyad āhur asambhavāt iti śuśruma dhīrāṇāṁ ye nas tad vicacakṣire.
anyat—different; eva—certainly; āhuḥ—it is said; sambhavāt—by worshiping the Supreme Lord, the Cause of all causes; anyat—different; āhuḥ—it is said; asambhavāt—by worshiping what is not the Supreme; iti—thus; śuśruma—I heard it; dhīrāṇāṁ—from the undisturbed authorities; ye—those; naḥ—unto us; tat—about that subject matter; vicacakṣire—perfectly explained.
TRANSLATION
It is said that one result is obtained by worshiping the Supreme Cause of all causes, and that another is obtained by worshiping what is not supreme. All this was heard from the undisturbed authorities who clearly explained it.
PURPORT
In this  mantra  of  Śrī Īśopaniṣad  the system of hearing from the undisturbed authorities is confirmed. Unless one hears from the bona fide  ācārya , who is never disturbed by the changes of the material world, one cannot have the real key to transcendental knowledge. The bona fide spiritual master, who has also heard the  Śruti mantras , or Vedic knowledge, from his undisturbed  ācārya , never manufactures or presents anything which is not mentioned in the Vedic literature. In the  Bhagavad-gītā  it is clearly said that the worshipers of the  Pitṛs , or forefathers, reach the forefathers, the gross materialists who make