Mahabharata 12.232.25

येनोपायेन शक्येत संनियन्तुं चलं मनःतं तं युक्तो निषेवेत न चैव विचलेत्ततः

yenopāyena śakyeta saṃniyantuṃ calaṃ manaḥtaṃ taṃ yukto niṣeveta na caiva vicalettataḥ

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