When one's senses are withdrawn into the mind, the result becomes that Brahma becomes manifested in it. Indeed, when the senses are destroyed, and the soul returns to the quality of pure existence, it is regarded as being transformed into Brahma.
ताभिः संयुक्तमनसो ब्रह्म तत् सम्प्रकाशते। शनैश्चोपगते सत्त्वे ब्रह्मभूयाय कल्पते॥