བཀའ་སྩལ་པ།
[The Lord Buddha] then said, “Śāradvatī­putra, if the nature of mind with which minds are endowed has neither existence nor non-existence, and if it is non-apprehensible, then Śāradvatī­putra, surely your question ‘Does this mind that is not the mind exist?’
Emptiness, Meditative Concentration, Non-Duality