the asya vamasya (rgveda 1.164) is one of the sage's most famous poems. early scholars (such as deussen in his philosophy of the upanisads) tried to say that the poems of dirghatamas were of a later nature because of their content, but this has no linguistic support which has been argued by modern sanskrit scholars (such as dr. c. kunhan raja in his translation of the asya vamasya hymn). the reason that earlier western scholars believed them to be of a later origin is due to the monist views found there. they believed that early vedic religion was pantheistic and a monist view of god evolved later in the upanisads - but the poems of dirghtamas (1.164.46) which say "there is one being (ekam sat) which is called by many names" proves this idea incorrect.