[768] Which phenomena (dhammā) are mental factors (cetasikā)?
The aggregate of feeling (vedanākkhandha), the aggregate of perception (saññākkhandha), the aggregate of volitional formations (saṅkhārakkhandha) — these phenomena are mental factors.
Which phenomena are not mental factors (acetasikā)?
Mind (citta), all form (rūpa), and the unconditioned element (asaṅkhatā dhātu) — these phenomena are not mental factors.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.