। ॥ ७९ ॥
In plain words
This doctrine — that what is not is the source — cannot stand, not by scripture and not by reason. So Being alone, sat, the one thing that is actually there, is the cause of every world there is.
Close to the Sanskrit
Since that, this doctrine of the non-existent, is not possible by scripture and reasoning — therefore Being alone, the reality, is the cause of all the worlds.