the Vedantic Seers, even after they had arrived at the crowning idea, the convincing experience of Sachchidananda as the highest positive expression of the Reality to our consciousness, erected in their speculations or went on in their perceptions to an Asat, a Non-Being beyond
Aurobindo argues that the Vedantic seers recognized a Non-Being transcending even Sachchidananda, demonstrating that Vedantic thought reaches beyond any fixed positive formulation of the Absolute.
, The Life Divine, 1939thesis