For those grossly engaged in identifying the body as the self, pious activity, or karma-yoga, is recommended. For those who identify the mind with the self, philosophical speculation, or jñāna-yoga, is recommended. But devotees standing on the spiritual platform have no need of such material conceptions of adulterated devotion. Adulterated devotional service does not directly aim for love of the Supreme Personality of Godhead. Therefore service performed strictly in conformity with the revealed scriptures is better than such viddha-bhakti because it is free from all kinds of material contamination. It is executed in Kṛṣṇa consciousness, solely to please the Supreme Personality of Godhead.
(Sri Caitanya Caritamrta----1:4:21-22----purport).

The example of misunderstanding a rope to be a snake is mentioned in the Māṇḍūkya Upaniṣad, but it is meant to explain the error of identifying the body with the soul. Since the soul is actually a spiritual particle, as confirmed in the Bhagavad-gītā (mamaivāṁśo jīva-loke), it is due to illusion (vivarta-vāda) that a human being, like an animal, identifiesthe body with the self. This is a proper example of vivarta, or illusion. The verse atattvato ’nyathā-buddhir vivarta ity udāhṛtaḥ describes such an illusion. To not know actual facts and thus to mistake one thing for another (as, for example, to accept the body as oneself) is called vivarta-vāda. Every conditioned living entity who considers the body to be the soul is deluded by this vivarta-vāda. One can be attacked by this vivarta-vāda philosophy when he forgets the inconceivable power of the omnipotent Personality of Godhead.
(Sri Caitanya Caritamrta----1:7:122----purport).

The saṅkīrtana movement has been introduced by Lord Caitanya Mahāprabhu just to dispel the illusion of māyā, by which everyone in this material world thinks himself to be a product of matter and therefore to have many duties pertaining to the body. Actually, the living entity is not his material body: he is a spirit soul. He has a spiritual need to be eternally blissful and full of knowledge, but unfortunately he identifies himself with the body, sometimes as a human being, sometimes as an animal, sometimes a tree, sometimes an aquatic, sometimes a demigod, and so on. Thus with each change of body he develops a different type of consciousness with different types of activities and thus becomes increasingly entangled in material existence, transmigrating perpetually from one body to another. Under the spell of māyā, or illusion, he does not consider the past or future but is simply satisfied with the short life span that he has gotten for the present. To eradicate this illusion, Śrī Caitanya Mahāprabhu has brought the saṅkīrtana movement, and He requests everyone to accept and distribute it.
(Sri Caitanya Caritamrta----1:9:36----purport).

Progress in cultivating the human spirit entails the gradual disappearance of the materialistic ego. Covered by ignorance, passion, and so-called goodness, the spirit soul thinks himself all in all and is covered by a false sense of ego. Thus he falsely identifies the soul with the body, and his bodily relations with material things become the objects of his attraction. This falseidentification and attraction for matter gradually dry up and fade away by success in the cultivation of the human spirit. That is the effect of such higher cultivation. Progress in spiritual culture brings about the disintegration of false ego and material attraction.
The ultimate goal of cultivating the human spirit is God realization and surrender unto God with a full sense of His all-pervasive nature. When a liberated soul thus surrenders unto the lotus feet of the all-pervading Godhead, the ocean of nescience becomes as insignificant to him as the water in the small hoofprint of a calf. He at once becomes eligible to be promoted to the spiritual kingdom, and he has nothing to do with the miserable land of the material world.
Cultivation of the human spirit is not, therefore, mere adjustment of materialistic anomalies. It is the process for preparing oneself to be promoted to the spiritual kingdom. No one can adjust the sufferings of material existence, but by spiritual culture one can elevate himself from the effects of such miserable life.
(Light of the Bhagavata).

At night in the rainy season the moving clouds reflecting the moonlight make the moon appear to be moving. This is called illusion. The spirit soul, or the living being, is the root of all the activities of the material body, but because of illusion the spirit soul remains covered by the gross and subtle material bodies. Thus covered, the conditioned soul identifies with the materialbody and becomes subject to the sense of false ego.
This false ego obliges a living being to consider his material body to be his self, the offspring of the body to be his children, and the land of the birth of the body to be an object of worship. Thus the living being's conception of nationalism is another type of ignorance. Because of ignorance, a living being identifies himself with the land of his birth and moves with the misconceptions of national ideas. In fact, however, a living being does not belong to any nation or species of life. He has nothing to do with the body, as the moon has nothing to do with the moving clouds.
(Light of the Bhagavata).

Conditioned human beings are expert at dealing with this material body and mind. These gross materialists, who cannot see beyond materialistic activities, find it impossible to believe that besides our material universe, a spiritual universe exists. Completely identifying with the body, such materialists are like animals, simply eating, sleeping, mating, and defending. They are so captivated by these four animalistic propensities that they lose the power to discriminate between sinful and pious activities. They tirelessly endeavor for a little sense gratification, but all their efforts end in futility. Many modern scientists have taken up the role of priests facilitating such gross activities, which are unbeneficial and fatal. These scientists have made available a variety of products meant simply to titillate the senses, thus creating a deadly competitive mood among the materialists, which has in turn caused an obnoxious atmosphere in society. People think they become free and independent through such sensual activities, but factually they become more tightly bound up in chains. The greater their accumulated wealth, the greater their anxiety and depravity. As much as they try to usurp the Supreme Lord's position of being the only enjoyer, that much and more are they drawn into the jaws of a horrible death. And these activities make a Herculean task out of such a simple and basic activity as sustaining the body, which needs a little nourishment only.
(Renunciation through Wisdom).

Identifying the self with the material body and mind, or thinking that the soul is material, or thinking that everything in relation to the body belongs to oneself—such illusions keep a person ignorant and bereft of self-realization. Therefore Lord Kṛṣṇa advises us to be situated in knowledge of the self. When we become spiritually aware, we can understand that the "I," the self, is not the body or mind; we can realize that we are products of the superior, spiritual energy of the Supreme Lord and hence fully spiritual and eternal. With realization of these transcendental truths comes knowledge of the actual nature of the material energy in its pure form. And when these spiritual realizations gradually mature, one achieves a natural distance from the dualities of material nature. At this stage of spiritual development, the false ego is destroyed, all false identification and titles are removed, and we are liberated from the shackles of the illusory, material energy on the strength of our spiritual association with the Transcendence. No longer does māyā entangle us in material activities.
(Renunciation through Wisdom).

Delusion is the perverted image of reality and is the hallmark of māyā, the Lord's external energy. This delusion is totally absent in His internal, spiritual potency. The jīva is a product of the Lord's superior, transcendental energy, but he becomes deluded into identifying his body as his self. Once this ignorance is dissipated, he can immediately understand the actual nature of the body. Illusion is possible on the mundane plane but never in the spiritual energy.
The variety visible in material nature is due to the influence of the Lord's spiritual energy. In other words, material nature is but a perverted reflection of spiritual energy. For example, sunlight is ever-existing, but when sunlight is reflected on water, there comes into being a new source of light that must accept the cycle of creation, maintenance, and annihilation. The original sun, of course, is not bound by such changes. This practical analogy helps us understand that the spiritual nature is transcendental to creation, maintenance, and annihilation, whereas the perverted reflection of the spiritual energy—the material nature—is bound by these three conditions. The material nature is illusory: sometimes it is there, and at other times it is not. When this illusory, temporary existence of "there and not there" is totally removed and in its place are manifested the name, form, qualities, associates, paraphernalia, and abode of the Lord, one is on the platform of satyaṁ param, the Absolute Truth, who is described here as nirasta-kuhakam, "forever free from the illusory representation of the material world."
(Renunciation through Wisdom).

"The luminous planets like the sun, moon or stars reflect themselves in different types of reservoirs, like water, oil or ghee. The reflection moves according to the movement of the reservoir. The reflection of the moon is on the water, and the moving water makes the moon also appear to be moving, but actually the moon is not moving. Similarly, by mental concoction the living entity attains different kinds of bodies, although actually he has no connection with such bodies. But on account of illusion, being enchanted by the influence of māyā, the living entity thinks that he belongs to a particular type of body. That is the way of conditioned life. Suppose a living entity is now in a human form of body. He thinks that he belongs to the human community, or a particular country or particular place. He identifies himself in that way and unnecessarily prepares for another body, which is not required by him. Such desires and mental concoctions are the cause of different types of bodies. The covering influence of material nature is so strong that the living entity is satisfied in whatever body he gets, and heidentifies with that body with great pleasure. Therefore, I beg to request you not to be overwhelmed by the dictation of your mind and body."
(Krsna Book).

Foolish persons are engaged in committing all sorts of sins due to the misconception of identifying the material body with the self. But one should be intelligent enough to understand to whom the body belongs. A foolish person indulges in killing animals to maintain the body, but he does not consider whether the body belongs to him or to his father or mother or maternal grandfather. Sometimes a father gives his daughter in charity to a person with a view of getting back the daughter's child as a son. The body may also belong to a stronger man who forces it to work for him. Sometimes a slave's body is sold to a master, and from that day on the body belongs to the master. And at the end of life the body belongs to the fire, because the body is given to the fire and burned to ashes. Or the body is thrown into the street to be eaten by the dogs and vultures.
(Krsna Book).

There are various details to be observed in the performance of sacrifices. They are known as deśa, place; kāla, time; pṛthag-dravya, the different detailed paraphernalia; mantra, hymns; tantra, scriptural evidences; agni, fire; ṛtvik, learned performers of sacrifices; devatā, the demigods; yajamāna, the performer of the sacrifices; kratu, the sacrifice itself; and dharma, the procedures. All these are for satisfying Kṛṣṇa. It is confirmed in the Bhagavad-gītā that He is the actual enjoyer of all sacrifices because He is directly the Supreme Personality of Godhead and the Supreme Absolute Truth, beyond the conception or speculation of the material senses. He is present just like an ordinary human boy, but for persons whoidentify themselves with the body, it is very difficult to understand Him. The brāhmaṇas were very much interested in the comforts of the material body and in elevation to the higher planetary residences called svarga-vāsa. They were therefore completely unable to understand the position of Kṛṣṇa.
(Krsna Book).

"Your constitutional position is that you are pure living soul," the Lord told Sanātana. "This material body cannot be identified with your real self; nor is your mind your real identity, nor your intelligence, nor false ego. Your identity is that of eternal servitor of the Supreme Lord Kṛṣṇa. Your position is that you're transcendental. The superior energy of Kṛṣṇa is spiritual in constitution, and the inferior external energy is material. Since you are between the material energy and the spiritual energy, your position is marginal. Belonging to the marginal potency of Kṛṣṇa, you are simultaneously one with and different from Kṛṣṇa. Because you are spirit, you are not different from Kṛṣṇa, and because you are only a minute particle of Kṛṣṇa, you are different from Him."
(Teachings of Lord Caitanya).

The Lord also said that the living entities are known as kṣetrajña, or "knowers of the field of activities." In the Thirteenth Chapter of Bhagavad-gītā, the body is described as the field of activities, and the living entity as kṣetrajña, the knower of that field. Although the living entity is constitutionally conversant with spiritual energy, or has the potency to understand spiritual energy, he is covered by the material energy and consequently identifies the body with the self. This false identification is called "false ego." Deluded by this false ego, the bewildered living entity in material existence changes his different bodies and suffers various kinds of miseries. Knowledge of the living entity's true position is possessed to different extents by different types of living entities.
(Teachings of Lord Caitanya).

In this quotation from the nine sages who were instructing Mahārāja Nimi, māyā is defined as "forgetfulness of one's relationship with Kṛṣṇa." Actually, māyā means "that which is not." It has no existence. Thus it is false to think that the living entity has no connection with the Supreme Lord. He may not believe in the existence of God, or he may think that he has no relationship with God, but these are all "illusions," or māyā. Due to absorption in this false conception of life, man is always fearful and full of anxieties. In other words, a godless concept of life is māyā. One who is actually learned in the Vedic literatures surrenders unto the Supreme Lord with great devotion and accepts Him as the supreme goal. When a living entity forgets the constitutional nature of his relationship with God, he is at once overwhelmed by the external energy. This is the cause of his false ego, his falseidentification of the body with the self. Indeed, his whole conception of the material universe arises from this false identification with the body, for he becomes attached to the body and its by-products. To escape this entanglement, he has only to perform his duty and to surrender unto the Supreme Lord with intelligence and devotion and with sincere Kṛṣṇa consciousness.
(Teachings of Lord Caitanya).

Unintelligent persons who cannot understand this doctrine of byproducts cannot grasp how the cosmic manifestation and the living entity are simultaneously one and different from the Absolute Truth. Not understanding this, one concludes, out of fear, that this cosmic manifestation and the living entity are false. Śaṅkarācārya gives the example of a rope being mistaken for a snake, and sometimes the example of mistaking an oyster shell for gold is cited, but surely such arguments are ways of cheating. As mentioned in the Māṇḍūkya Upaniṣad, the rope for a snake and the oyster for gold examples have their different applications and can be understood as follows. The living entity in his original constitutional position is pure spirit. When a human being identifies himself with the material body, he may be said to be mistaking a rope for a snake, or an oyster shell for gold. The doctrine of transformation is accepted when one thing is mistaken for another. Actually the body is not the living entity, but the doctrine of transformation accepts the body as the living entity. Every conditioned soul is undoubtedly contaminated by this doctrine of transformation.
(Teachings of Lord Caitanya).

The living entity is the eternal servant of Kṛṣṇa. Being part and parcel of the Lord, he is constitutionally pure, but due to his contact with material energy, he identifies himself with either the gross or the subtle material body. Such identification is certainly false and constitutes the genuine platform of the theory of illusion. The living entity is eternal: he can never be subjected to the limits of time, as are his gross and subtle bodies. The cosmic manifestation is never false, but it is subject to change by the influence of the time factor. For a living entity to accept this cosmic manifestation as the field for his sense enjoyment is certainly illusory. This material world is the manifestation of the material energy of the Lord. This is explained by Kṛṣṇa in the Bhagavad-gītā (7.4):
bhūmir āpo ’nalo vāyuḥ khaṁ mano buddhir eva ca
ahaṅkāra itīyaṁ me bhinnā prakṛtir aṣṭadhā
"Earth, water, fire, air, ether, mind, intelligence and false ego—all together these eight constitute My separated material energies."
The material world is the inferior energy of the Supreme Personality of Godhead, but it is not a fact that the Supreme Lord has been transformed into this material world. The Māyāvādī philosophers, devoid of true understanding, have confused the theory of illusion and the theory of the cosmic manifestation by word jugglery. The theory of illusion can be applied to a person who identifies himself with the body. The living entity is the superior energy of the Supreme Lord, and the material world is the inferior energy. Both, however, are prakṛti (energy). Although the energies are simultaneously one with the Lord and different from Him, the Lord never loses His personal form due to the transformation of His different energies.
(Sri Caitanya Caritamrta----2:6:173----purport).