Madhvaon Brahma Sūtra 3.4.50

The duty of imparting knowledge is laid down in the Mathara Sruti thus: “ He who studies this Vidya (scripture) indeed becomes fit to see Brahman; he shall freely impart it to men ; as he imparts, so he becomes great; ” and such knowledge, it may be thought, is to be imparted with due publicity, so that many may receive it; but such a view should not be held ; for there is a reason (for its being kept from the public). In that case, (i.e., if it be imparted in public, even the ineligible may happen to receive it, which is prohibited thus: “ O Lord of the Vedas, do not deliver us into the hands of those thieves that hate the blissful Lord and (consequently) are our enemies, that are only addicted to food, etc. (the grati- fication of their senses), that are only fit to be in the dark hell of miseries in consequence of their wicked conduct; that deny the existence of this Lord and the other thing (the world) ; that only acknowledge something of no description. On the other hand, 0 Lord of speech, always deliver us into those who by their calm devotion rejoice in the Lord, who are capable of (right) thinking, and perform duties irrespective of consequences, who bear in their heart the Ruler of the gods and who acknowledge none higher than the omnipresent Lord Vishnu ” (Rv. II. 13-26). Another Sruti also says thus: “ Vidya went to Brahma (Vayu) and said : Protect me, I am thy treasure, do not deliver me unto the unworthy, the perverse or the evil-spirited; but always deliver me unto him who is straightforward.”