大乘起信論義記 3.88

3.88

云何為四？一者、淨法名為真如。二者、一切染因名為無明。三者、妄心名為業識。四者、妄境界所謂六塵。

What are the four? First, pure phenomena, named tathatā. Second, the cause of all defilement, named avidyā. Third, the false mind, named the karmic consciousness. Fourth, false perceptual objects, namely the six sensory dusts.