Mettagūmāṇavakapañhāniddesa

Suttapiṭaka · Khuddakanikāya · Cūḷaniddesa · Vol. 30 · Section 151

[151] "You have asked me indeed about the source of suffering (dukkha), (said the Blessed One to Mettagū,) I shall declare it to you as one who understands: Sufferings arise with acquisitions (upadhi) as their cause — whatever sufferings there are in the world, of many kinds.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.