The Rig Veda [Unabridged, English Translation] (The Vedas)
Most Sanskrit works were commentaries either on the Vedas or on the Ramayana and Mahabharata epics, written by well known figures such as Sayanacharya (who wrote a treatise on the Vedas called Vedartha Prakasha whose English translation by Max Muller appeared in 1856), and Vidyaranya that extoll...
to the extent there was no time left over to build permanent buildings of worship. Which feels to me like a life writing poems. The Vedas spent much of their time