तत्र तं बुद्धिसंयोगं लभते पौर्वदेहिकम्।
यतते च ततो भूयः संसिद्धौ कुरुनन्दन।।6.43।।
6.43 There he becomes endowed with that wisdom acired in the previous body. and he strives more than before for perfection, O scion of the Kuru dynasty.
6.43 - 6.44 There, in that existence, he regains the mental disposition for Yoga that he had in the previous birth. Like one awakened from sleep, he strives again from where he had left before attaining complete success. He strives so as not to be defeated by impediments. This person who has fallen away from Yoga is borne on towards Yoga alone by his previous practice, i.e., by the older practice with regard to Yoga. This power of Yoga is well known. Even a person, who has not engaged in Yoga but has only been desirous of knowing Yoga, i.e., has failed to follow it up, acries once again the same desire to practise Yoga. He then practises Yoga, of which the first stage is Karma Yoga, and transcends Sabda-brahman (or Brahman which is denotable by words). The Sabda-brahman is the Brahman capable of manifesting as gods, men, earth, sky, heaven etc., namely, Prakrti. The meaning is that having been liberated from the bonds of Prakrti, he attains the self which is incapable of being named by such words as gods, men etc., and which comprises solely of knowledge and beatitude. After thus describing the glory of Yoga the verse says:
Tatra tam buddhisamyogam labhate paurvadehikam; Yatate cha tato bhooyah samsiddhau kurunandana.
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