śuddhāśuddhaphalā mantrāstathā tūbhayasaṁjñakāḥ |
subhagāyā bhavantyēva tadēvātha nigadyatē ||
The mantra of Mahātripurasundarī (here described by the word subhagā, indicating Hādi Lōpāmudrā specifically, which is considered the more ancient of the three main schools of śrīvidyā), based on the results attained, can be classified into śuddha, aśuddha, and śuddhāśuddha.
The following twelve vidyās are said to be śuddhā (or granting śuddha-phala):
1. Manu (kādi)
2. Chandra (sādi, hādi)
3. Kubera (hādi)
4. Kāmarāja (kādi)
5. Lopāmudrā (hādi)
6. Nandi (sādi, hādi)
7. Sūrya (hādi, sādi)
8. Viṣṇu (hādi)
9. Skanda (hādi)
10. Shiva (kādi, hādi)
11. Durvāsā (kādi)
12. Agastya (kādi)
Two more variations namely Indrōpāsita (sādi) and Unmanī vidyā (kādi) also fall into the category of śuddha. The ones belonging to the śuddha category are said to grant siddhi without a doubt when practiced as directed by the scriptures.
Celebrated authors and works including the Dakṣiṇāmūrti Samhitā do not discuss the aśuddha-bhēda. The category of śuddhāśuddha (mixed or variegated i.e. śabala) includes Varuṇa, Dharmarāja, Agni, Nāgarāja, Vāyu, Soma, īśāna, Rati, Nārāyaṇa, Brahmā, and Br̥haspati. All these are kādi variations.