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## [Karika 71, 72] Devagama
**65** If we consider substance (dravya) as unreal and mode (paryaya) as real, as per the 65th sutra, then neither substance nor mode can be considered as having any existence. This is because, without modes, substance cannot be the cause of any action or function, and without substance, modes cannot be the cause of any action or function. If we consider either of them as the cause, it will contradict the principle of sequential and simultaneous existence (kram-yogapady). A substance or mode, being of a single nature, cannot have sequential and simultaneous existence. Without sequential and simultaneous existence, there cannot be any action or function, and without action or function, there will be no existence of the object, only non-existence. Therefore, if we eliminate either substance or mode, the other will also be eliminated, and there will be no order or arrangement of the reality.
The characteristic of substance is that it has qualities (guna) and modes (paryaya), as stated in the Tattvartha Sutra, "dravyaṁ guna-paryaya-vat". Qualities are simultaneous (yugapat) and modes are sequential (krama). The characteristic of mode is "tad-bhavaḥ pariṇāmaḥ", which means it is the specific form of the substance, which occurs sequentially and simultaneously. Sequential transformation is called "paryaya" and simultaneous transformation is called "guna". This difference in characteristics of substance and mode proves their distinct nature.
Thus, substance and mode are distinct in some ways due to their different characteristics, they are one in some ways due to the impossibility of separating them, they are both in some ways due to the intention of arranging them sequentially, and they are neither in some ways due to the perspective of their simultaneous existence. The remaining three aspects should also be understood in the same way.
**This concludes the fourth chapter of the Devagama-Apta-Mimamsa.**