[418] Which phenomena (dhammā) are indeterminate (abyākata)?
On the occasion when one develops the path (magga) for rebirth in the formless (arūpūpapatti) and—with the complete transcending of perceptions of form (rūpasaññā), with the passing away of perceptions of sensory impact (paṭighasaññā), with non-attention to perceptions of diversity (nānattasaññā), with the abandoning of pleasure and …—enters upon and dwells in the fourth jhāna accompanied by the perception of the base of the infinity of space (ākāsānañcāyatana): on that occasion there is contact (phassa) … there is non-distraction (avikkhepa) … These phenomena are wholesome (kusala).
Because that same wholesome kamma of the formless sphere (arūpāvacara) has been done and accumulated, as its result (vipāka) one—with the complete transcending of perceptions of form, with the passing away of perceptions of sensory impact, with non-attention to perceptions of diversity, with the abandoning of pleasure and …—enters upon and dwells in the fourth jhāna accompanied by the perception of the base of the infinity of space: on that occasion there is contact … there is non-distraction …
These phenomena are indeterminate.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.