Bhagavad Gita 6.43 — Past progress returns

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

tatra taṃ buddhisaṃyogaṃ labhate paurvadehikam | yatate ca tato bhūyaḥ saṃsiddhau kurunandana ||

Meaning

There he regains the understanding gained in his previous body, and strives even harder for perfection, Arjuna.