Mahabharata 1.143.31
बालोऽपि यौवनं प्राप्तो मानुषेषु विशां पतेसर्वास्त्रेषु परं वीरः प्रकर्षमगमद्बली
bālo'pi yauvanaṃ prāpto mānuṣeṣu viśāṃ patesarvāstreṣu paraṃ vīraḥ prakarṣamagamadbalī
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book