[378] Therein, what is formation (saṅkhāra)?
That which is volition (cetanā), intention (sañcetanā), the state of intending (sañcetayitatta) — this is called formation. …
Therein, what is feeling (vedanā) with contact (phassa) as condition?
That which is bodily ease, bodily pleasure; the easeful, pleasant experience born of body-contact; the easeful, pleasant feeling born of body-contact — this is called feeling with contact as condition.
Therein, what is existence (bhava) with feeling as condition?
Excluding feeling: the perception aggregate (saññākkhandha), the volitional-formations aggregate (saṅkhārakkhandha), the consciousness aggregate (viññāṇakkhandha) — this is called existence with feeling as condition. …
Therefore it is said: "Thus is the origin of this whole mass of suffering (dukkha)."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.