大乘起信論裂網疏 4.8

4.8

性德真如雖非染淨，以無染故，且名淨法。譬如未熏之衣，意指無覆無記識而言之，本是全體真如，故即名真如也。無明熏故有染相者，從所熏染種起染法現行，具如前文所明三相、六相等也。

Although the tathatā of natural virtue is neither defiled nor pure, because it is free of defilement, it is provisionally named the pure dharma. Like unperfumed clothing, it is spoken of with reference to the undefiled-indeterminate consciousness: it is originally the entire substance of tathatā, and so is directly called tathatā. 'Because nescience perfumes it, there are defiled marks' means that from the perfumed defiled seeds arise the active manifestations of defiled dharmas, fully possessing the three marks, six marks, and so forth, as explained previously.