Mahabharata — Anushasana Parva, Shloka 104
मातङ्ग–शक्रसंवादः
Mataṅga–Śakra Dialogue on Tapas, Status, and Moral Qualities
तथा त्वमपि कौन्तेय भक््त्या परमया युत: । गड्भामभ्येहि सतत प्राप्स्यसे सिद्धिमुत्तमाम्,कुन्तीनन्दन! इसी प्रकार तुम भी पराभक्तिके साथ सदा गंगाजीकी उपासना करो। इससे तुम्हें उत्तम सिद्धि प्राप्त होगी
tathā tvam api kaunteya bhaktyā paramayā yutaḥ | gaṅgām abhyēhi satataṁ prāpsyase siddhim uttamām ||
同样地，昆蒂之子啊，你当具足至上的虔敬，恒常亲近并礼拜恒河。如此行持，你必得最上悉地。
भीष्म उवाच
Educational Q&A
Bhishma teaches that steady, supreme devotion expressed through continual reverence for the sacred Gaṅgā leads to the highest siddhi—an elevated spiritual fulfillment and auspicious success grounded in dharma.
In the Anuśāsana Parva, Bhishma is instructing the son of Kuntī on dharmic conduct and meritorious observances; here he specifically urges ongoing worship/approach to Gaṅgā as a powerful, sanctifying practice that yields the best outcome.