Verse
प्रयाणकाले मनसाऽचलेनभक्त्या युक्तो योगबलेन चैव ।भ्रुवोर्मध्ये प्राणमावेश्य सम्यक्स तं परं पुरुषमुपैति दिव्यम् ॥
This supreme Self is the Seer, the Ancient of Days, subtler than the subtle and (in his eternal self-vision and wisdom) the Master and Ruler of all existence who sets in their place in his being all things that are; his form is unthinkable, he is refulgent as the sun beyond the darkness; he who thinketh upon this Purusha in the time of departure, with motionless mind, a soul armed with the strength of Yoga, a union with God in bhakti and the life-force entirely drawn up and set between the brows in the seat of mystic vision, he attains to this supreme divine Purusha.
Gītā 8·10