6.43 The understanding returns Krishna speaks

तत्र तं बुद्धिसंयोगं लभते पौर्वदेहिकम्
यतते च ततो भूयः संसिद्धौ कुरुनन्दन

tatra taṁ buddhi-sanyogaṁ labhate paurva-dehikam
yatate cha tato bhūyaḥ sansiddhau kuru-nandana

There the understanding gained in the former body returns, and from there one strives again for perfection, son of Kuru.

Explanation

The understanding comes back.

There the buddhi-saṁyoga gained in the former body returns, and from there one strives again.

This is the load-bearing claim of the passage. Whatever was understood is not re-earned from nothing — it is returned, which makes the effort cumulative rather than repeated.

Word by word

tatra: there
tam: that
buddhi-sanyogam: reawaken their wisdom
labhate: obtains
paurva-dehikam: from the previous lives
yatate: strives
cha: and
tataḥ: thereafter
bhūyaḥ: again
sansiddhau: for perfection
kuru-nandana: Arjun, descendant of the Kurus