Skanda Purana — Mahesvara Khanda, Shloka 63
इंद्रियाणां सात्त्विकाच्च त्रिगुणानि च तान्यपि । एतैः संसिद्धयंत्रेण सच्चिदानन्दवीक्षणात्
iṃdriyāṇāṃ sāttvikācca triguṇāni ca tānyapi | etaiḥ saṃsiddhayaṃtreṇa saccidānandavīkṣaṇāt
又由萨埵分位生起诸根（indriya：知觉与作用之机能）；彼等亦在三德之中运作。凭此成就之修持器具，由观照“萨特—契特—阿难陀”（有—觉—乐），而得圆满。
Lomaharṣaṇa (Sūta) (deduced, Māheśvarakhaṇḍa narrative style)
Scene: A yogin in a temple corridor: senses depicted as five horses being gently reined; above, a luminous triad-inscription Sat-Cit-Ānanda radiates from a Śiva-liṅga, indicating inner vision arising from disciplined instrumentality.
FAQs
Even the senses are guṇa-bound, yet they can become instruments of realization when disciplined toward the direct vision of sat–cit–ānanda.
No tīrtha is mentioned; the emphasis is on inner discipline and realization.
No explicit ritual; it implies sādhana (discipline) as the ‘instrument’ leading to realization.