"Every living being is anxious for full freedom because that is his transcendental nature. And this freedom is obtained only through the transcendental service of the Lord. Illusioned by the external energy, everyone thinks that he is free, but actually he is bound up by the laws of nature. A conditioned soul cannot freely move from one place to another even on this earth, and what to speak of one planet to another. But a full-fledged free soul like Nārada, always engaged in chanting the Lord's glory, is free to move not only on earth but also in any part of the universe, as well as in any part of the spiritual sky. We can just imagine the extent and unlimitedness of his freedom, which is as good as that of the Supreme Lord. There is no reason or obligation for his traveling, and no one can stop him from his free movement. Similarly, the transcendental system of devotional service is also free. It may or may not develop in a particular person even after he undergoes all the detailed formulas. Similarly, the association of the devotee is also free. One may be fortunate to have it, or one may not have it even after thousands of endeavors. Therefore, in all spheres of devotional service, freedom is the main pivot. Without freedom there is no execution of devotional service. The freedom surrendered to the Lord does not mean that the devotee becomes dependent in every respect. To surrender unto the Lord through the transparent medium of the spiritual master is to attain complete freedom of life."
(Śrīmad-Bhāgavatam 1.6.37, Purport)
"The need of the spirit soul is that he wants to get out of the limited sphere of material bondage and fulfill his desire for complete freedom. He wants to get out of the covered walls of the greater universe. He wants to see the free light and the spirit. That complete freedom is achieved when he meets the complete spirit, the Personality of Godhead. There is a dormant affection for God within everyone; spiritual existence is manifested through the gross body and mind in the form of perverted affection for gross and subtle matter. Therefore we have to engage ourselves in occupational engagements that will evoke our divine consciousness. This is possible only by hearing and chanting the divine activities of the Supreme Lord, and any occupational activity which does not help one to achieve attachment for hearing and chanting the transcendental message of Godhead is said herein to be simply a waste of time. This is because other occupational duties (whatever ism they may belong to) cannot give liberation to the soul. Even the activities of the salvationists are considered to be useless because of their failure to pick up the fountainhead of all liberties. The gross materialist can practically see that his material gain is limited only to time and space, either in this world or in the other. Even if he goes up to the Svargaloka, he will find no permanent abode for his hankering soul. The hankering soul must be satisfied by the perfect scientific process of perfect devotional service."
(Śrīmad-Bhāgavatam 1.2.8, Purport)
"Attainment of love of Godhead means complete freedom from all other attractions. The conditioned soul has many aspirations such as becoming a religious man, a rich man, or a first-class enjoyer or becoming God himself, or becoming powerful like the mystics and acting wonderfully by getting anything or doing anything, but all these aspirations should be rejected by the prospective devotee who actually wants to revive his dormant love of God. The impure devotee aspires after all of the abovementioned material things by perfection of devotion. But a pure devotee has none of the tinges of the above contaminations, which are the influence of material desires, impersonal speculations and attainment of mystic powers. One can attain the stage of love of God by pure devotional service, or by 'a learned labor of love,' for the sake of the devotee's lovable object, the Personality of Godhead."
(Śrīmad-Bhāgavatam 2.2.31, Purport)
"If the spirit soul engages in the spiritual activities of devotional service, he is completely freed from the platform of birth and death. His next position is complete spiritual freedom from a material body. The fear of death is the action of the kāla, or the time factor, which represents the influence of the Supreme Personality of Godhead. In other words, time is destructive. Whatever is created is subject to destruction and dissolution, which is the action of time. Time is a representation of the Lord, and it reminds us also that we must surrender unto the Lord. The Lord speaks to every conditioned soul as time. He says in Bhagavad-gītā that if someone surrenders unto Him, then there is no longer any problem of birth and death. We should therefore accept the time factor as the Supreme Personality of Godhead standing before us."
(Śrīmad-Bhāgavatam 3.26.16, Purport)
"For the perfect yogī who has attained success in the method of leaving his body in perfect consciousness, transferring from one planet to another is as easy as an ordinary man’s walking to the grocery store. As already discussed, the material body is just a covering of the spiritual soul. Mind and intelligence are the undercoverings, and the gross body of earth, water, air and so on is the overcoating of the soul. As such, any advanced soul who has realized himself by the yogic process, who knows the relationship between matter and spirit, can leave the gross dress of the soul in perfect order and as he desires. By the grace of God, we have complete freedom. Because the Lord is kind to us, we can live anywhere—either in the spiritual sky or in the material sky, upon whichever planet we desire. However, misuse of this freedom causes one to fall down into the material world and suffer the threefold miseries of conditioned life. The living of a miserable life in the material world by dint of the soul’s choice is nicely illustrated by Milton in Paradise Lost. Similarly, by choice the soul can regain paradise and return home, back to Godhead."
(Easy Journey to Other Planets, Chapter 1)
"In the Bhagavad-gītā (7.20, 23) it is said that only unintelligent, bewildered persons driven by a strong desire for sense gratification worship the demigods for the temporary relief of temporary problems. Since the living being is materially entangled, he has to be relieved from material bondage entirely to attain permanent relief on the spiritual plane, where eternal bliss, life and knowledge exist. Śrī Īśopaniṣad therefore instructs that we should not seek temporary relief of our difficulties by worshiping the dependent demigods, who can bestow only temporary benefit. Rather, we must worship the Absolute Personality of Godhead, Kṛṣṇa, who is all-attractive and who can bestow upon us complete freedom from material bondage by taking us back home, back to Godhead."
(Śrī Īśopaniṣad, Chapter 12)
"Now, a living entity, a spiritual spark, is wandering, wandering from not only from one country to another country or from one body to another, but one planet to another. The qualification of a living entity is called sarva-ga. Sarva-ga. Sarva means all, and ga means one can go. You can go anywhere. Just like you have the facility of travelling over the surface of the earth or in the outer space on the earth. But you cannot go beyond the orbit. This is called conditioned life.
In conditioned life we are limited in our travelling. But in spiritual life we can travel anywhere. The best example is Nārada Muni. He can travel anywhere he likes. Even in this universe we have got a planet which is called Siddhaloka, the planet of the perfect. Not perfect completely, but they are called siddhas. Siddha means almost perfect. The inhabitants of that planet, they can travel without any aid of sputnik or aeroplane from one planet to another. We get this information from Śrīmad-Bhāgavatam.
So in spiritual life we have got complete freedom to move, to act, to enjoy. So that spiritual knowledge should be cultivated. That is the best utilization of this human form of life. If we do not utilize this human form of life for spiritual cultivation, then we are practically committing suicide, ātma-han."
(Srila Prabhupada Lecture, New York, January 4, 1967)
"So first of all we have to understand this distinction between the spirit soul and this material body. If we can understand what is that spirit soul, then we can understand what is this spiritual movement. Otherwise, simply on material understanding, it is very difficult to understand what is spiritual life or spiritual platform. But there is. We can simply feel like that at the present moment, but there is a spiritual world, spiritual life. And what is that spiritual life? Complete freedom. Complete freedom. Eternity, blissful and full of knowledge—that is spiritual life. Completely distinct from this bodily concept of life.
Spiritual life means eternity, blissful life of knowledge. And this material life means nonpermanent, ignorance and full of miseries. This body means it will not stay, and it is always full of miserable condition. And there is no blissfulness. Always in the material we have got some kind of unhappiness. But on account of our long association with this material life we have become so dull-headed that it is very difficult to understand what is spiritual life, what are spiritual activities, what is spiritual world, what is God, what is our relationship with Him. Therefore this Kṛṣṇa consciousness movement is a kind of training to understand what is spiritual life and what is spiritual world, what is God."
(Srila Prabhupada Lecture, Stockholm, September 5, 1973)
"So far Narada Muni is concerned, in His previous life He was a maidservant's son, but by the mercy of the devotees He later on became siddha and next life He appeared as Narada with complete freedom to move anywhere by the grace of the Lord. So even though He was in his previous life a maidservant's son there was no impediment in the achievement of His perfect spiritual life. Similarly any living entity who is conditioned can achieve the perfectional stage of life by the above mentioned processes and the vivid example is Narada Muni."
(Srila Prabhupada Letter, June 21, 1970)