In plain words
The poet, to the Lord: Now I know that you are God even to Īśa [Rudra] and to the four-faced one [Brahmā]; now I know you, my Lord, now I truly know you. You are the cause of all; you are all that has been learned and all that is yet to be learned; you are Nārāyaṇa, whose gracious work is to protect. This I now know well.