yathoktam "anyathārthasya nāstitvaṃ gamyate 'nupalambhataḥ / upalambhasya nāstitvam anyenetyanavasthitiḥ"
As it has been said: "Otherwise the non-existence of the object is known through non-apprehension, and the non-existence of the apprehension [is known] through another [non-apprehension] - thus [there is] infinite regress"