Avatarika
प्राणादित्यदृष्टिविशिष्टस्योद्गीथस्योपासनमुक्तमेवानूद्य प्रणवोद्गीथयोरेकत्वं कृत्वा तस्मिन्प्राणरश्मिभेदगुणविशिष्टदृष्ट्याअक्षरस्योपासनमनेकपुत्रफलमिदानीं वक्तव्यमित्यारभ्यते—
In plain words
Having reviewed the meditation on the Udgītha as associated with prāṇa and the sun, and having established the oneness of the Praṇava and the Udgītha, the text now begins to explain the meditation on the imperishable syllable, endowed with the distinct attributes of prāṇa's rays, which grants the reward of many sons.
Close to the Sanskrit
Having restated the meditation on the udgītha qualified by the vision of prāṇa and āditya, and having established the identity of praṇava and udgītha, now it is commenced to be explained the meditation on the imperishable syllable, characterized by the vision of the differentiation of prāṇa's rays, which yields the fruit of many sons.