Shiva Purana — Rudra Samhita, Shloka 60
संध्याचरित्रवर्णनम् (Sandhyā-caritra-varṇanam) — “Narration of Sandhyā’s Austerity and Encounter with Śiva”
तपसा सत्समो नास्ति न भूतो न भविष्यति । येन यज्ञस्समारब्धो ज्योतिष्टोमो महाविधिः
tapasā satsamo nāsti na bhūto na bhaviṣyati | yena yajñassamārabdho jyotiṣṭomo mahāvidhiḥ
无有功德可与苦行（tapas）等同——过去未曾有，未来亦不会有——因为凭借苦行，依大法则而行的殊胜“光明颂”（Jyotiṣṭoma）大祭，方能顺利发起并运转成就。
Suta Goswami
Tattva Level: pashu
Shakti Form: Satī
Role: liberating
FAQs
It declares tapas (disciplined austerity) as the highest purifier and enabler of dharma—surpassing other merits—because it refines the seeker’s intention and capacity for sacred action, aligning the soul toward Shiva’s grace and liberation.
In Shaiva practice, outer worship gains depth through inner tapas—vows, restraint, and steady devotion—so Linga worship is not merely ritual but a disciplined offering of the self, making the worship fit to receive Shiva’s presence (Saguna) and realize His transcendent nature (Nirguna).
Adopt tapas as a vrata: fasting or regulated diet, celibacy/restraint, truthfulness, and daily japa of Shiva’s name (especially the Panchakshara, “Om Namaḥ Śivāya”), supporting any puja or observance with disciplined consistency.