Shiva Purana
नाप्रशांताय दातव्यमेतज्ज्ञानमनुत्तमम् ॥ न पुत्रायाशुवृत्ताय नाशिष्याय च सर्वथा ॥ ७४ ॥
This excellent knowledge shall not be delivered to one who is not quiet, nor to a son who is not well behaved nor to one who is not one’s own disciple.
english translation
nAprazAMtAya dAtavyametajjJAnamanuttamam ॥ na putrAyAzuvRttAya nAziSyAya ca sarvathA ॥ 74 ॥
hk transliteration by Sanscript