In plain words
The poet, to the people of the world: With a single bow he dammed the surging sea, and so that the worlds might live he destroyed the king of the rākṣasas in battle. You do not say ‘many-walled Tiruvaraṅgam, the famed Temple where our great hero dwells for good’; you who lacked his grace already in the womb, you are wasting your time.