大乘起信論義記 2.244

2.244

亦無色相可見；而有見色相者，唯是隨染業幻所作，非是智色不空之性，以智相無可見故。

[Treatise:] Nor are there visible material forms. What sees material forms is only that produced by karmic illusions following defilement; it is not the non-empty nature of cognition's form, because the mark of cognition cannot be seen.