Mahabharata 6.28.6

बन्धुरात्मात्मनस्तस्य येनात्मैवात्मना जितःअनात्मनस्तु शत्रुत्वे वर्तेतात्मैव शत्रुवत्

bandhurātmātmanastasya yenātmaivātmanā jitaḥanātmanastu śatrutve vartetātmaiva śatruvat

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