大乘起信論裂網疏 4.103

4.103

Next is contemplating that the four aggregates of sensation, perception, mental formations, and consciousness are unestablished. Inquiring into momentary mental phenomena through the four phases—namely, not yet arisen, about to arise, arising, and already arisen—they do not abide for even a brief moment; there is no real phenomenon whatsoever, but merely names.