It is true that Shankara looked upon the Upanishads as irrefutable. However, the Upanishads themselves did not constitute a self-sustaining or logically elucidated body of thought. They were a compilation of pronouncements based in parts on profound intuition, but also a compendium of several other views, a great deal of obiter dicta, including conventional theism. Beyond the breathtaking glimpses they provided of the absolute, there was no attempt towards the structuring of a coherent philosophy.
Shankara gives structure to Upanishads
