Bhagavad Gita 6.43 Chapter 6, Verse 43

तत्र तं बुद्धिसंयोगं लभते पौर्वदेहिकम् ।
यतते च ततो भूयः संसिद्धौ कुरुनन्दन ॥६.४३॥

tatra taṃ buddhisaṃyogaṃ labhate paurvadehikam
yatate ca tato bhūyaḥ saṃsiddhau kurunandana

Meaning

There one regains the understanding gained in the previous life, and strives again, even harder, for perfection, O joy of the Kurus.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 6.43 (Chapter 6, The Yoga of Meditation (Atma Samyama Yoga), Verse 43)