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The siddhāṣṭi (perfect being) is like a stone and a wall, the pure form of the soul.
(483) It accumulates karma-phala (fruits of karma) in the form of ātmā-pariṇāma (transformation of the soul) which is characterized by duḥkha-lakṣaṇa (characteristics of suffering). And because of its unique nature, it becomes absorbed in it. Therefore, due to the relationship of cause and effect, it is certain that it performs karma and experiences its fruits. Thus, the soul has a causal-consequential relationship with karma through its actions, and a cause-and-effect relationship with the bhavakarma (karmic actions) due to impure perception. But according to the pure perception of the right view, the soul is free from all karmic stains and impurities, and is pure in nature, "the eternal God himself."
Just as a stone placed on a wall is not part of the wall, but is external to it and distinct from it, so the stone is not part of the wall, it is simply a stone; similarly, the soul, which is the knower, is also a substance like pudgala (matter) in practical terms, but it is external to the knower, distinct from the stone and the wall, so it is not part of the external substance, the knower is like the wall, it is simply the knower, this is certain. Just as the white quality of the stone is its nature to adorn the wall, so the knowledge quality of the soul is its nature to know the object. Just as the stone, in practical terms, is related to the external substance that is the wall, it does not become part of the wall, that is, it does not become the wall, but remains a stone in its own right; similarly, the soul also knows the external substance in practical terms, but it does not become part of the external substance, that is, it does not become the external substance, but remains the knower in its own right. Because that is its nature. (For reference, see Samyāsāra, verses 356-365 and Śrī Amṛtacandracāryaji's extraordinary commentary "Ātmakhyāti").
"Just as a stone is not part of another stone, so too is the soul not part of anything else."
–Śrī Samyāsāra
"Just as a stone is placed on a wall, it is not part of the wall, but is external to it and distinct from it, so the stone is not part of the wall, it is simply a stone; similarly, the body, speech, soul, and mind are not part of karma, but are external to it and distinct from it, so they are not part of karma, they are simply themselves; similarly, the soul is not part of the body, speech, mind, or karma, but is external to them and distinct from them, so the soul is not part of them, it is simply itself."
–Śrī Yaśovijayaji's Sāḍa Trīṁśa, verses, and the knowledge quality of the soul is its nature, so it illuminates the world, but it does not become the world, just as the moon does not become the sky (see page 75). Knowledge always knows the object, but the object never becomes the knower. Thus, the relationship of the knower is such that the soul, which is of the nature of knowledge, remains in its own form and knows the object, which is the world. Thus, the soul is not the body, speech, mind, karma, attachment, aversion, pudgala, or any other substance. The soul is distinct from all of these. All of these are external to it.