Krsna is the Supreme Personality of Godhead and cause of all causes, He can do anything He wants, even over-ride the jiva-soul's free will.

Krsna never interferes with the jiva-soul's "free will," even when they choose to reject Him because He wants His subjects to think for themselves and voluntarily serve Him without being dictated too or forced.

However, even this kind consideration is ultimately up to Krsna to sanction because Krsna is the Supreme Personality of Godhead and cause of ALL causes and can do anything He wants, even over-ride the jiva-soul's free will anytime He likes.

This means Krsna is not controlled by any rules and regulations, or binded by any laws in both the spiritual and material world. At any time He likes, He can change anything He likes, after all everything is resting on Him and not a blade of grass can move without the will of Krsna.

Only Krsna can do this if He wants because He is the Supreme Lord and not a blade of grass moves without His sanction. Krsna knows everything past, present and future because He is omniscient. But generally Krsna allows the marginal living entities (jiva-souls) to express themselves in their own unique way, which means allowing them to have their choice to stay in the spiritual world, or enter the material world. 

So, without any objections from Krsna to follow Him or not follow Him, the jiva-souls can choose to stay in the spiritual worlds, or enter the temporary material creation and do what ever they want without Krsna. 

Such choices are based on their individual constitutional attribute of "free will" that every jiva-soul (marginal living entity) is endowed with.

In most nearly all cases, Krsna will not interfere with the jiva-soul's free will because He wants a relationship with those who can contribute and take personal responsibilities for their own thoughts and actions.

This allows the jiva-souls to voluntarily make their own unique offerings to Krsna and suprise Him.

This is what it means to be an iindividual jiva-soul (marginal living entity) who has the "free will" that allows them to further enrich, contribute and even surprise Krsna with their loving exchanges with Him. 

Otherwise, one is just a mindless drone or puppet who only obeys without personal contributions, foolishly thinking "surrender" means allowing Krsna to control your every thoughts, actions and words, allowing Krsna to possess you and take complete control of your personality and individuality.

The fact is, this kind of mindless bogus "surrender" is dangerous impersonalism.

Bali Mardana - "An example of free will is someone can choose Kṛṣṇa or turn away? Is that an example of free will?"

Srila Prabhupāda - "Yes, because if you accept Kṛṣṇa, then you must follow what Kṛṣṇa says. If you don't follow Kṛṣṇa, then what is the use of talking of Kṛṣṇa? If he accepts Kṛṣṇa, he must abide by the injunction of Kṛṣṇa."(Morning Walk, Jan 22, 1974, Hawaii)

Srila Prabhupada  - "Free will means that you can act wrongly. That is free will. Unless there is chance of doing wrong or right, there is no question of free will. Where is free will then? If I act only one sided, that means I have no free will. Because we act sometimes wrongly, that means free will."

Hayagriva - "A man may know better but still act wrongly."

Srila Prabhupada - "Yes, but that is free will but misuses his free will, just like a thief who knows he is stealing, it is bad, but still he does it. That is free will. He cannot check his greediness, so in spite of his knowing that he is doing wrong thing—he will be punished, he knows; he has seen another thief, he was punished, he was put into prison— everything he knows, but still he steals. Why? Misuse of free will. But unless there can be misuse of free will, then there is no question of free will." (Excerpt from: Philosophy Discussions with Srila Prabhupada – Rene Descartes)

Srila Prabhupada – "So everyone can know that independence means one can use it properly, or one can misuse it. That is independence. If you make it one-way only, that is not independence, that is force." (Los Angeles, June 23, 1975)

Genuine loving exchanges can never exist if one's relationship with God was not a "two-way" exchange of feelings, but only a domineering "one-sided" affair with "a so called God." 

Freedom and free will obviously includes having the choice to accept or reject Krsna.

Srila Prabhupada - "Love is reciprocal, voluntary, good exchange of feeling, then there is love. Not by force! Krsna does not want to become a lover like that." (Washington DC July 8, 1976)

Srila Prabhupāda – "Unless there are "two-persons," where is the question of love? Love means two persons, then there is exchange, then there is love. I must deal with you open-hearted, you must deal with me open-hearted, then there is love. So if you want to love Kṛṣṇa, God, then these things must be there." (Aug 9, 1976, Tehran)

Srila Prabhupada - "Love means two. There MUST be two, the lover and the beloved. Kṛṣṇa is already lover. He loves you so much that He's trying to get you back. Therefore love cannot be one or love cannot be executed only one, there MUST be another one. I love somebody; somebody loves me, so there must be lover, there must be beloved. We must understand that love means you take and you give also. Suppose if you love somebody and you simply take from him, but you don't give. Oh, do you think it is very good? No, it is not good, that is NOT love, that is exploitation and forced obedience. If I go on simply taking from you, and if I don't offer you anything, that is simply exploitation." (Srila Prabhupada quotes 1966 - 1974, Vaniquotes)

Srila Prabhupada - "The impersonalist philosophy is oneness. So how there be love with just one? Is it possible? Have you got any such experience that love means one? No. Love means two. There MUST be two, the lover and the beloved. Kṛṣṇa is already lover. He loves you so much that He's trying to get you back. That is Kṛṣṇa's attempt. "Please, My dear boy, or My dear friend, My dear servant." (Lecture SB, Canto 2 Ch 1 text 3, Paris, June 12, 1974)

Devotee – "When we are in the spiritual sky and serving Krsna, we have a perfect relationship with Krsna, what causes us to fall down in the material world, because we’re already there serving Krsna?"

Srila Prabhupada – "Because you desire to fall down. Here it is explained that don’t fall down."

Devotee – "Srila Prabhupada, I can’t understand why we should have an impure desire when we are already serving in Vaikuntha."

Srila Prabhupada – "Because you have got little freedom, it is free will, why one is not coming here and going to the liquor shop? It is 

Bhagavatam it says that Krsna did not want us to come to this material world. If Krsna did not want us to come, why are we here?"

Srila Prabhupada – "Yes, you forced Krsna to allow you to come. Just like sometimes a child forces his father. Father says, "My dear son, do not do this. Do not go there." But he insists, “Oh, I must go. I must go." All right, you go at your risk and suffer. What can be done? So because you are son of God you have got independence, full independence, therefore you have acquired the quality of your father, so God does not interfere with your independence. If you persist that "I must go and enjoy independently," God says, "All right, you can go." This is the position. You have to take sanction. That is a fact. But when you persist, God sanctions. And you come to the material world and enjoy." (Melb, Australia June 25, 1974)

Acyutananda – "In the Bhagavad Gita it says, "Once coming to the spiritual world he never returns to the material worlds, so he can return?"

Srila Prabhupada – "If he likes he can return, that is voluntary."

Guru-kripa – "How is it that one can become envious of Krsna?"

Srila Prabhupada – "You have got little independence, you can violate. Because you are part and parcel of God. 

God has got full independence, but you have got independence too, proportionately, because you are part and parcel, so if he likes, he can return. That independence has to be accepted. We can misuse that. 

Krsna-bahirmukha haïä bhoga väïchä kare. That misuse is the cause of our falldown." (Mayapur, Feb 19, 1976)

In actual fact, if the jiva-souls never had their free will, then genuine voluntary loving exchanges and reciprocation experienced in a "two-way" relationship, would not exist because loving relationships between two, can never exist among the "impersonalists" who foolishly believe everything is "all-one" consciousness. 

Srimati Radharani is the internal energy, we are marginal energy (jiva-souls)

Srila Prabhupada - "Regarding your question about our relationship with Srimati Radharani, She is the internal energy, we are marginal energy (jiva-souls). Marginal means sometimes internal, sometimes external. When we are under the internal energy, that is our normal life, and when we are under the external energy, that is our abnormal life. Therefore, we are called marginal energy (jiva-souls); we can be either this way or that way. But being qualitatively one with the purusa, our tendency is to remain in the internal energy. Being in the external energy is our artificial attempt." (Letter to Lilavati, Allston, Massachusetts, 25 April, 1969)

Those who claim "not even the leaves can fall down from Vaikuntha" because Krsna is in complete control of the jiva-souls and will not let them fall down, are not understanding the real meaning and implications of having "free will" (freedom), and that only a "two-way" relationship that does NOT deny personal choices that includes even rejecting Krsna ALWAYS exists as part of the individual expression of EVERY jiva-soul.

This is allows the association between Krsna and the jiva-souls, to for ever expand into loving personal exchanges as well.

In other words, the spiritual planets are not a "one-way" impersonal dictatorship where Krsna controls every aspect of His devotees like a puppet master controls his puppets.

This also means one's position on the spiritual planets can never be claimed to be eternally permanent, even though it is the jiva-souls original and natural home.

This is because there is always free will in both Vaikuntha and Goloka Vrindavana. 

This means at any time the jiva-souls can leave if they choose to do so, but most, over 90%, choose to never leave Vaikuntha and Goloka-Vrindavana.

Many foolishly claim the jiva-souls can never fall down from Vaikuntha or Goloka-Vrindavana, which is correct for over 90% because they choose to never fall down.

However, all jiva-souls can choose to leave at anytime due to free will. Therefore it is always their choice and as already explained, most choose NOT to leave the spiritual worlds. 

Also fall down from Vaikuntha or Goloka-Vrindavana is not because of Maya (material cause) because Maya does not exist in the spiritual worlds.

However, free will, or the ability to make one's own decisions and choices, DOES always exists there.

As said above, Maya and material energy cannot exist in Vaikuntha and Goloka-Vrindavana and tempt the jiva-souls, therefore Maya is NOT the cause of falling down from the spiritual worlds.

But as said, the ability to choose does exist in both Vaikuntha and Goloka-Vrindavana where one always has a choice.

"Surrendering" to Krsna in Goloka-Vrindavana, or Visnu on the Vaikuntha planets is NOT impersonal, which means the jiva-souls do not have to give up their free will, individuality and unique personality in order to love and serve Krsna.

In fact it is the opposite, without free will one can NEVER love Krsna.

And what are the symptoms of free will?

It means having the awareness of an independent self, a unique individual personality that is separate from Krsna's Personality, and being able to voluntarily make your own choices in your service to Krsna.

Having "free will" ALWAYS allows the jiva-souls to voluntarily choose their own contributions as a unique offering to Krsna in loving service. 

Without "free will," loving reciprocational exchanges and positive and negative emotions with Krsna are not possible.

In the spiritual worlds all marginal living entities (jiva-souls) are nitya-siddha (liberated) personalities. 

However, while in the material world, those same jiva-souls who choose to enter the material creation, ARE nitya-baddha (meaning materially conditioned) 

Nitya-siddha and nitya-baddha are different sides the jiva-soul's personality they can choose to be. 

Although nitya-siddha is the jiva-soul's, "original position," living in their eternal home on the Vaikuntha planets, or in Goloka-Vrindavana serving the interests of the Lord.  

The jiva-soul's "original position" are always nitya-siddha, Srila Prabhupada explains here-

Srila Prabhupada - "The actual constitutional position of every marginal living entity is nitya-siddha. By following the rules and regulations and instructions of the spiritual master, the jiva-soul can become AGAIN nitya-siddha. So the Krsna consciousness movement is to make the nitya-baddhas AGAIN nitya-siddha." (NY City Lecture on CC, July 13, 1976)

As said above, all jiva-souls are originally nitya-siddha, while nitya-baddha is a conditioned state they fall down to by rejecting Krsna. (either to the material creation or the impersonal brahman) 

Therefore, because of free will, the jiva-souls can choose to enter the temporary material worlds where they are there known as nitya-baddha, or latter on, after being frustrated with material existence, the impersonal Brahmajyoti.

All jiva-souls can choose to remain nitya-siddha or they can enter the material creation as nitya-baddha. 

Nitya-siddha and nitya-baddha are different sides of each jiva-soul's personality, there are NOT two separate categories of jiva-souls, one being nitya-baddha, and the other being nitya-siddha.

There are those who foolishly believe a class of jiva-souls can never fall down from Vaikuntha and Goloka Vrindavana and always remain nitya-siddha, such an idea is nonsense because that means they have no free will.

As explained above, free will means being always able to choose right or wrong, otherwise you have no free will as explained above.

Only the many Visnu-tattvas expansions of Krsna and Radharani in their many different roles in Krsna's eternal pastimes in Vrindavan and the Vaikuntha planets never fall down.

And includes of course those jiva-souls "who choose NOT to fall down."  

The fact is, the jiva-souls (nitya-siddha) in Vaikuntha and Goloka-Vrindavana, CAN fall down at any time and become nitya-baddha in the material creation, but most jiva-souls (over 90% as said above) choose NEVER to fall down.

A pure devotee is trying to remember Krsna by always chanting Hare Kṛṣṇa and praying to never fall down..^^..