Shiva Purana — Rudra Samhita, Shloka 18
त्रिपुरवर्णनम् (Tripura-varṇanam) — “Description of Tripura”
अनिर्विण्णास्ततस्सर्वे क्रमशोऽवर्द्धयंस्तपः । तेपुस्त्रयस्ते तत्पुत्रा विधिमुद्दिश्य सत्तमाः
anirviṇṇāstatassarve kramaśo'varddhayaṃstapaḥ | tepustrayaste tatputrā vidhimuddiśya sattamāḥ
その後、彼らは皆、少しも挫けず、次第に苦行を増し強めた。あの三人の高貴な子らは、心を梵天（ヴィディ）に定め、その恩寵と命令を求めてタパスを修した。
Sūta Gosvāmi (narrating to the sages of Naimiṣāraṇya)
Tattva Level: pashu
Shiva Form: Sadāśiva
FAQs
It emphasizes steadfastness in sādhanā: true seekers do not become despondent but intensify tapas progressively, showing that spiritual ripening comes through sustained discipline and grace.
Though the verse names Vidhī (Brahmā) as the intended deity, the Shiva Purana’s broader frame presents tapas and devotion as preparatory purification; such steadiness supports Saguna worship (including Linga-upāsanā) by stabilizing mind and intention for receiving divine revelation.
A clear takeaway is gradual, consistent tapas—daily japa and meditation with increasing steadiness; in a Shaiva setting this can be paired with Panchākṣarī japa (Om Namaḥ Śivāya) and regulated vows, rather than sporadic intensity.