yad āditya-gataṁ tejo jagad bhāsayate ’khilam
yach chandramasi yach chāgnau tat tejo viddhi māmakam || 12 ||

My Understanding : When he looks within himself, he will realize his true power. He will understand that it is the soul that sustains the body. He should recognize that the brightness of the fire and the radiance of the moon are manifestations of his own essence.