Few infer there is nothing above the witness, therefore, nothingness is the ultimate rest, for them it is said it is not, even for nothingness to be witnessed the existence of the witness is the must. Existence of the knower is inevitable for to know anything, even for to know the nothingness. If assumed nothingness witnesses everything, it cannot be too, because the absence cannot witness the presence, but it is the presence that witnesses the absence, hence we deduct the witness is the ultimate rest, the unsurpassable, and no thing exist above it.
~Sw. Chidananda Tirtha