purvasya-of the first half; adau-in the beginning; para-ardhasya-of the superior half; brahmah-Brahma-kalpa; nama-of the name; mahan-very great; abhut-was manifest; kalpah-millennium; yatra-whereupon; abhavat-appeared; brahma-Lord Brahma; sabda-brahma iti-the sounds of the Vedas;yam-which; viduh-they know.