Sat is the One True Existent from which all existence emerges. But where has the One True Existent emerged? From That which is beyond all existence, which cannot be defined or described by anything that exists. That is Asat or simply Tat. And there is a yet greater Beyond that contains both these as well as transcends them. It is all that exists and yet nothing that exists, iti iti as well as neti neti. That is expressed in the formula Om Tat Sat.
Affectionately,
Alok Da

