[249] What, on that occasion, is rectitude of the mental body (kāyujukatā)?
That which, on that occasion, is the straightness, rectitude, non-crookedness, non-bentness, non-tortuousness 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 rectitude of the mental body.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.