BG 6.43
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
Then, the experience acquired in his former life will revive, and with it, he will more eagerly strive for perfection than before.
Translated by Shri Purohit Swami
Then he comes into contact with the knowledge acquired in his former body and strives even more for perfection, O Arjuna.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
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