[66] Whatever mind (citta) is ceasing (nirujjhamāna), has that mind arisen (uppanna)?
Yes.
Or rather, whatever mind has arisen, is that mind ceasing?
At the moment of arising (uppāda-kkhaṇa), mind has arisen, but that mind is not ceasing; at the moment of dissolution (bhaṅga-kkhaṇa), mind both has arisen and is ceasing.
Whatever mind is not ceasing, has that mind not arisen?
At the moment of arising, mind is not ceasing, but it is not the case that that mind has not arisen; past and future mind neither is ceasing nor has arisen.
Or rather, whatever mind has not arisen, is that mind not ceasing?
Yes.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.