One who wants to become free, who wants to become liberated, must first of all learn that he is not this material body. Mukti, or liberation, means freedom from material consciousness. In the Śrīmad-Bhāgavatam also the definition of liberation is given. Muktir hitvānyathā-rūpaṁ svarūpeṇa vyavasthitiḥ: (SB 2.10.6) mukti means liberation from the contaminated consciousness of this material world and situation in pure consciousness. All the instructions of Bhagavad-gītā are intended to awaken this pure consciousness, and therefore we find at the last stage of the Gītā's instructions that Kṛṣṇa is asking Arjuna whether he is now in purified consciousness. Purified consciousness means acting in accordance with the instructions of the Lord. This is the whole sum and substance of purified consciousness. Consciousness is already there because we are part and parcel of the Lord, but for us there is the affinity of being affected by the inferior modes. But the Lord, being the Supreme, is never affected. That is the difference between the Supreme Lord and the small individual souls.
What is this consciousness? This consciousness is "I am." Then what am I? In contaminated consciousness "I am" means "I am the lord of all I survey. I am the enjoyer." The world revolves because every living being thinks that he is the lord and creator of the material world. Material consciousness has two psychic divisions. One is that I am the creator, and the other is that I am the enjoyer. But actually the Supreme Lord is both the creator and the enjoyer, and the living entity, being part and parcel of the Supreme Lord, is neither the creator nor the enjoyer, but a cooperator. He is the created and the enjoyed. For instance, a part of a machine cooperates with the whole machine; a part of the body cooperates with the whole body. The hands, legs, eyes, and so on are all parts of the body, but they are not actually the enjoyers. The stomach is the enjoyer. The legs move, the hands supply food, the teeth chew, and all parts of the body are engaged in satisfying the stomach because the stomach is the principal factor that nourishes the body's organization. Therefore everything is given to the stomach.