उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
उदयास्तमयात्पूर्वम् आरम्य विधिना शुचिः कामान्मोहाद्भयाल्लोभात् संध्यां नातिक्रमेद्द्विजः
udayāstamayātpūrvam āramya vidhinā śuciḥ kāmānmohādbhayāllobhāt saṃdhyāṃ nātikrameddvijaḥ
Beginning before sunrise and before sunset, purified and following the prescribed rite, a twice-born should not let the Sandhyā (twilight worship) pass by—whether driven by desire, delusion, fear, or greed.
Suta Goswami (narrating Linga Purana teachings to the sages of Naimisharanya)
It establishes strict nitya-kāla discipline: purity and timely Sandhyā are foundational for Shiva-oriented sādhanā, preventing the practitioner (pashu) from slipping back into pasha (bondage) through negligence.
Indirectly, it points to Shiva as Pati—the Lord who is approached through niyama and inner purity; Sandhyā becomes a daily alignment of the individual self with the sacred order that culminates in steadiness for Shiva-realization.
Sandhyā-vandana performed at both twilights with śauca (purity) and vidhi (proper method), serving as a restraint against kama, moha, bhaya, and lobha—key obstacles to Pashupata-style inner control.