There he obtains that connection to the understanding (buddhi) from his previous body, And he strives from there again, for perfection (saṃsiddhi), O joy of the Kurus (Kurunandana).
There he regains a depth of understanding from his former life and strives further to perfection, Arjuna.
(43) There is he united with the soul as it had matured in his former body; and once again he strives to win perfection's prize.
6.43 There he becomes endowed with that wisdom acquired in the previous body. and he strives more than before for perfection, O scion of the Kuru dynasty.
6.43 There he regains the disposition of mind which he had in his former body, O Arjuna, and from there he strives much more for success in Yoga.
6.43 Thee he comes in touch with the knowledge acquired in his former body and strives more than before for perfection, O Arjuna.