ध्यानयज्ञः, संसार-विष-निरूपणम्, पाशुपतयोगः, परा-अपरा विद्या, चतुर्वस्था-विचारः (अध्यायः ८६)
आप्यं द्रवमिति प्रोक्तं वर्णाख्यो वह्निरुच्यते यत्संचरति तद्वायुः सुषिरं यद्द्विजोत्तमाः
āpyaṃ dravamiti proktaṃ varṇākhyo vahnirucyate yatsaṃcarati tadvāyuḥ suṣiraṃ yaddvijottamāḥ
Water is declared to be the principle of fluidity; fire is spoken of as that which manifests colour and form. That which moves about is called Wind; and that which is hollow—O best of the twice-born—is Space (ākāśa).
Suta Goswami (narrating a tattva-teaching within the Linga Purana discourse)
It identifies the defining marks (lakṣaṇas) of the elements, supporting bhūta-śuddhi and pañcabhūta contemplation used to purify the devotee’s body-mind before Linga-pūjā, so the Pashu approaches Pati with reduced pāśa (bondage).
By classifying water, fire, wind, and space through their functions, it implies that these bhūtas are knowable effects within prakṛti, while Shiva as Pati is the transcendent ground that illumines and governs them without being limited by their properties.
Bhūta-viveka and bhūta-śuddhi (elemental discernment and purification), a Pāśupata-aligned preparatory discipline for mantra-japa, prāṇāyāma, and focused Linga-upāsanā.