Acharya Prashant explains that the concept of Prakriti and Purusha is a model for understanding. He clarifies that anything that can be conceptualized or thought of is a model because it represents something else. If it were not a model, it would have to be the Truth itself. Since the body is not the Truth, and the Truth is not bodily, any description of it, including the body itself, is a model. He states that every word used in speech is an exercise in modeling, and a model is fundamentally the same as a concept. The speaker describes this model as very useful, specifically for the Purusha, which he defines as consciousness (Chetna), distinguishing it from Atma (the Self). Prakriti is defined as everything mechanical within a person. Purusha, or consciousness, is that which is dependent on the body (Prakriti) yet is not satisfied with purely bodily or material things. This consciousness is what seeks liberation. The mind's structure is entangled, and this model helps in understanding it. Acharya Prashant elaborates on the relationship between consciousness (Purusha) and the body (Prakriti). Consciousness is deeply dependent on the body; for instance, if the head is hit with a hammer, consciousness suffers. However, consciousness is not the brain, even though it is dependent on it. He uses the analogy of a husband (Purusha) and wife (Prakriti) to describe this inseparable yet dissatisfying relationship. The entire body is Prakriti, and the consciousness (Purusha) is attached to it but can never be fully satisfied by this relationship. He concludes by explaining the role of spirituality. Spirituality addresses the urge of consciousness to be liberated; it speaks to consciousness, not to the brain. The brain, being a mechanism, can only interpret information based on its old, settled patterns, much like a computer. It can translate but cannot truly understand. Understanding is a function of consciousness. Spirituality brings something new that the brain cannot decipher, but consciousness can grasp it, even if it requires a stretch.