四不退
Từ Điển Thuật Ngữ Phật Học Hán Ngữ
The four kinds of non-backsliding, which includes three kinds of non-backsliding 三不退, on top of which the Pure Land sect adds another 處 place or abode, i. e. that those who reach the Pure Land never fall away, for which five reasons are given termed 五種不退. The 法相 Dharmalakṣaṇa sect makes their four 信, 位, 證, and 行, faith, position attained, realization, and accordant procedure.