Bhagavad Gita 6.43

तत्र तं बुद्धिसंयोगं लभते पूर्वदेहिकम् |
यतते च ततो भूयः संसिद्धौ कुरुनन्दन

Translation

On taking such a birth, O descendant of Kurus, they reawaken the wisdom of their previous lives, and strive even harder toward perfection in Yog.