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The Tattvarthsutra cannot be acquired without making distinctions in clothing, because clothing comes in many types. Therefore, distinctions have to be made between khadi fabric and mill fabric. Similarly, in the realm of Tattvajñāna, there are two types of substance: non-sentient and sentient, and the sentient category must also be divided into worldly and liberated types, etc. Distinctions of this kind must be made. All such distinctions are placed within the category of transactional logic.
From the examples mentioned above, it can be seen that the nāigama logic, relying on customary usage, is straightforward because it is based on a common aspect. Since the assertion is dependent on a general principle, the generalization in nāigama is evident. The saṅgraha logic is essentially a direct trade of cognitive integration and is therefore also general; while the vyavahāra logic is based on differentiations, it still operates on the foundations of general action, making it also general. Thus, these three logics are described as separate from the substantial nature of the realities.
What is the difference among the three mentioned above, and what is their relationship?
The subject of nāigama is the most extensive; it can be both primary and secondary depending on the specific traditional assertion. The subject of saṅgraha is less expansive than nāigama because it is merely general. The subject of vyavahāra is even less than that of saṅgraha, as it pertains to specific characteristics based on subjects that are consolidated in saṅgraha.