Mahabharata 12.185.24

ये गुरूनुपसेवन्ते नियता ब्रह्मचारिणःपन्थानं सर्वलोकानां ते जानन्ति मनीषिणः

ye gurūnupasevante niyatā brahmacāriṇaḥpanthānaṃ sarvalokānāṃ te jānanti manīṣiṇaḥ

Our plain-language meaning of this verse is waiting for scholar review.