In different sūtras, the term rnyog pa refers to different sets of problems that beset those on the path. A possible referent here is the set of four (“four kinds of stain”) found in Cultivating Trust in the Great Vehicle (Toh 144, UT22084-057-003-28) namely, anger (khong khro), lack of trust (yid mi ches), hatred (sdang ba), and doubt (the tshom).