[63] What, on that occasion, is proficiency of the mental body (kāyapāguññatā)?
That which, on that occasion, is the proficiency, the quality of being proficient, the state of being proficient, of the aggregate of feeling (vedanākkhandha), of the aggregate of perception (saññākkhandha), and of the aggregate of volitional formations (saṅkhārakkhandha) — this, on that occasion, is proficiency of the mental body.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.