Dhammachai Day - The Beginning of the victory through Dhamma

The Biography of Phrarajbhavanavisudh

Dhammacakkapavattana Sutta: The Sermon : 2. Self-Mortification [attakilamathanuyoga]

This is the practice of self-denial or self-mortification which is a non-Buddhist practice. It is one of many practices favoured by non-Buddhist ascetics such as Niganthas