yajna-adayah-the Lord's incarnation known as Yajna and others; yah-who; kathitah-already spoken of; paurusyah-of the Supreme Person; tanavah-incarnations; nrpa-O King; manu-adayah-the Manus and others; jagat-yatram-universal affairs; nayanti-conduct; abhih-by the incarnations; pracoditah-being inspired.