Having attained Mahāmudrā, the practitioner obtains the supreme destiny;by the union of the sun and the moon, he certainly achieves siddhi.

Paramāṃ gatim — the supreme destiny — refers to the final liberation, mokṣa.Mahāmudrā is not just a physical technique but a vehicle towards ultimate realization.

Candra-sūrya-samāyogāt — by the union of the sun and the moon.This is the essence of Haṭha Yoga: Ha (sun, Piṅgalā, prāṇa) and Ṭha (moon, Iḍā, apāna) unite in Suṣumnā.This union of opposites reflects the integration of all dualities.

Siddhiṃ dhruvam — siddhi certainly.Dhruva means fixed, certain, inevitable.The text guarantees that whoever correctly practices Mahāmudrā will inevitably achieve perfection.Siddhis include both yogic powers and final liberation.