大乘起信論裂網疏 4.6

4.6

The clothing being neither foul nor fragrant illustrates the nature that accords with conditions yet is immutable, originally being neither defiled nor pure. Being perfumed by a foul thing so that it has a foul scent illustrates the immutable nature according with defiled conditions to have defiled marks; being perfumed by a fragrant thing so that it has a fragrant scent illustrates the immutable nature according with pure conditions to have pure functions.