Twelfth book of the Khuddaka-nikāya of the Sutta-piṭaka attributed by the commentary to Gotama Buddha’s disciple Sāriputta. This text is later than much of the canon and attempts to explain in a systematic way how understanding of the Buddha’s basic teaching can lead to enlightenment.
ed. A.C. Taylor, 2 volumes, 1905, 1907, reprinted as one volume 1979
Translation: The Path of Discrimination.