Bhagavad Gita 6.43
तत्र तं बुद्धिसंयोगं लभते पौर्वदेहिकम्।
यतते च ततो भूयः संसिद्धौ कुरुनन्दन।।6.43।।
Tatra tam buddhisanyogam labhate paurvadehikam
Yatate cha tato bhuyah sansiddhau kurunandana
Simple meaning, written by AIIn that state one attains the union of intellect that precedes the physical body, and then strives further toward perfection, O son of Kuru.