Bhagavad Gita 6.43

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

tatra taṃ buddhisaṃyogaṃ labhate paurvadehikamyatate ca tato bhūyaḥ saṃsiddhau kurunandana

Then he comes into contact with the knowledge acquired in his former body and strives even more for perfection, O Arjuna.

गीता