In Classical Yoga philosophy, particularly Patanjali's Yoga Sutras, God (Īśvara) is conceptualized as a special, supreme Puruṣa (consciousness). Unlike other puruṣas (individual souls), Īśvara is eternally pure, untouched by afflictions (kleśas), actions (karma), or their results. He is omniscient, omnipotent, and the original teacher of all teachers, existing as a perfect archetype of the liberated self. Importantly, Īśvara is not a creator God in the conventional sense who created the universe ex nihilo, nor is He directly involved in its ongoing operation.

Īśvara's role in achieving Kaivalya (absolute isolation/independence of Puruṣa from Prakriti, or matter/mind) is primarily instrumental and contemplative. Devotion to Īśvara (Īśvara-praṇidhāna) is one of the niyamas (observances) prescribed in Ashtanga Yoga. By meditating on Īśvara or surrendering to Him, the yogi can:

1. Overcome Obstacles (Antarāyas): Devotion helps reduce distractions and mental impediments on the path to samādhi.

2. Facilitate Samādhi: Concentrating on Īśvara, as a perfect object of meditation, purifies the mind and accelerates the process of meditative absorption.

3. Reduce Ego: Surrendering to a higher power diminishes ego (asmita) and attachments, which are major barriers to liberation.

Thus, Īśvara acts as a guide, an object for focus, and a catalyst for mental purification, aiding the yogi's individual journey towards self-realization and the ultimate independence of Puruṣa in Kaivalya. Īśvara helps achieve kaivalya but does not grant it; it is a self-achieved state.