Adhyaya 70: आदिसर्गः—महत्-अहङ्कार-तन्मात्रा-भूतसृष्टिः, ब्रह्माण्डावरणम्, प्रजासर्गः, त्रिमूर्ति-शैवाधिष्ठानम्
त्रिधा यद्वर्तते लोके तस्मात्त्रिगुण उच्यते चतुर्धा प्रविभक्तत्वाच् चतुर्व्यूहः प्रकीर्तितः
tridhā yadvartate loke tasmāttriguṇa ucyate caturdhā pravibhaktatvāc caturvyūhaḥ prakīrtitaḥ
因其在世间以三种方式运作,故称“具三德”(triguṇa)。又因其分判为四重,故宣说为“四重显现”(caturvyūha)。
Suta Goswami (narrating the doctrine as received in the Purana’s teaching lineage)
It frames the cosmos encountered in Linga-pūjā as guṇa-governed (threefold), while pointing to a higher Shaiva principle that also expresses itself in a fourfold order—helping the worshipper discern the manifested world from Shiva (Pati) who is ultimately beyond guṇas.
It implies a distinction: worldly functioning is triguṇic (prakṛti and its effects), yet the supreme Shaiva reality can be spoken of as arranging manifestation in a fourfold way; in Shaiva Siddhanta, Shiva as Pati is not limited by guṇas even while governing their play for the sake of sṛṣṭi and anugraha (grace).
The takeaway for Pāśupata-oriented sādhana is guṇa-śuddhi: observing and transcending sattva–rajas–tamas through discipline, mantra, and Linga-upāsanā, so the Pashu (soul) loosens pāśa (bondage) and turns toward Pati (Shiva).