[65] What on that occasion is rectitude of the mental body (kāyujukatā)?
That which on that occasion is the straightness (ujutā), the rectitude (ujukatā), the non-crookedness, the non-curvedness, the non-bentness of the aggregate of feeling (vedanākkhandha), of the aggregate of perception (saññākkhandha), 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.