MN 1:170.1–170.5

nibbānaṁ nibbānato abhijānāti; nibbānaṁ nibbānato abhiññāya nibbānaṁ na maññati, nibbānasmiṁ na maññati, nibbānato na maññati, nibbānaṁ meti na maññati, nibbānaṁ nābhinandati. Taṁ kissa hetu? ‘Pariññātantaṁ tathāgatassā’ti vadāmi. Tathāgatavasena sattamanayabhūmiparicchedo niṭṭhito.

He directly knows extinguishment as extinguishment. Having directly known extinguishment as extinguishment, he does not conceive it to be extinguishment, he does not conceive it in extinguishment, he does not conceive it as extinguishment, he does not conceive that ‘extinguishment is mine’, he does not approve extinguishment. Why is that? Because the Realized One has completely understood it to the end, I say.