Mahabharata 12.109.16

पितॄन्दश तु मातैका सर्वां वा पृथिवीमपिगुरुत्वेनाभिभवति नास्ति मातृसमो गुरुःगुरुर्गरीयान्पितृतो मातृतश्चेति मे मतिः

pitṝndaśa tu mātaikā sarvāṃ vā pṛthivīmapigurutvenābhibhavati nāsti mātṛsamo guruḥgururgarīyānpitṛto mātṛtaśceti me matiḥ

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