The eternal individual jiva-souls being generated from the marginal plane, does not mean they were created, originated or generated from some beginning point in the spiritual sky, because the individual jiva-souls were never created and therefore have no origin to be generated.

Generated from a source means the individual jiva-souls belong to a category of eternal personalities who are beginningless and endless.

This means the individual jiva-souls were never created, nor generated from any origin, because they have always existed, and will continue to exist as individual spiritual bodily living "persons" as their full spiritual potential in their natural perpetual home of the Vaikuntha planets and Goloka-Vrindavana.  

Falling to the temporary material world of repeated birth and death means being possibly covered by the 8 million 400 species of material bodily forms in the material world.  

The individual jiva-souls are known as the marginal living entities, or marginal plane, a category of eternal individual jiva-souls who are spiritual personalities as a bodily form for infinity.

Generated clearly means the eternal individual jiva-souls come from an eternal category of living entities known as the marginal energy or plane.

Furthermore, the individual jiva-souls did not originate from the impersonal brahmajyoti, tatastha-sakti, the Body of Maha-Visnu or even Kṛṣṇa. They never came into being or were generated from a beginning because the individual jiva-souls are beginningless and endless and were never created as Bhagavad Gita As It Is chapter two explains, they have always existed over infinity.

The individual jiva-souls never originated or were generated from tatastha-sakti as some foolishly claim because again, there is no origin for the individual jiva-souls who like Krsna and Viṣṇu, eternally exist. 

In other words, just like Krsna has always existed, so have the individual jiva-souls.

This means the individual jiva-souls never originated or were generated from the impersonal (inactive) brahmajyoti, the Body of Maha-Visnu, or the fallen condition known as tatastha-sakti,  all three are fallen conditions for the individual jiva-souls, whose real eternal natural home is the Vaikuntha planets and Goloka-Vrindavana in the spiritual world.  

Srila Prabhupada - "So this temporary material world is the taṭastha (materially conditioned) characteristics, and the spiritual world is the permanent (personal) characteristics. So our effort is to get out of this taṭastha (materially conditioned) characteristics and enter the permanent (personal)  characteristics. That is called spiritual elevation." (Lecture CC, Madhya-lila 20.354-358, New York City, Dec 28, 1966)

Srila Prabhupada - "Because the individual soul is apt to fall down sometimes under the clutches of māyā to the material world, it is called taṭastha śakti." (Lecture BG, Ch 7 Text 4-5 Bombay, March 30, 1971)

Maya or material energy does not exist in the spiritual world however, free will eternally exists there that allows the individual jiva-souls to make their own decisions, voluntary offerings and contributions, and even accept or reject Krsna if they choose. 

Srimad Bhagavatam explains the fall down of the marginal living entity (jiva-souls) from the Vaikuntha planets and Goloka-Vrindavana to the material world, in the 4th Canto of Srimad Bhagavatam, Chapter 28 text 53, where the Supreme Lord is disguised as a brahmana.

The brāhmaṇa said - "My dear friend, even though you cannot immediately recognize Me, can't you remember that in the past you had a very intimate friend? Unfortunately, you gave up My company and accepted a position as enjoyer of this material world." (SB, Canto 4 Ch 28 text 53)

The inactive brahman effulgence (impersonal brahmajyoti or void) worshipped by impersonalists, mundane religionists, Buddhists and mayavadis, are "fallen conditions" the individual jiva-souls fall down too, but can never remain in that "fallen condition" of inactivity eternally. 

Eventually, they are forced to leave that dormant condition because the nature of the individual jiva-souls are to be always  "active" in the service of Krsna and not remain inactive. 

So, eventually the fallen individual jiva-souls leave the impersonal brahmajyoti or void and again take birth in the material world.

Revatīnandana dasa - "Srila Prabhupāda you very clearly explained to me once in a letter that if the jiva-soul then goes into the brahmajyoti, he is considered still fallen. Still fallen. Does that means the whole brahmajyoti is composed of fallen souls? You see my question? If I go there, I'm a jīva-soul, and I go to the brahmajyoti I'm still fallen."

Srila Prabhupāda - "Yes."

Revatīnandana dasa - "That means all jīva-souls there in the impersonal Brahman (Brahmajyoti) are also fallen souls?"

Srila Prabhupāda - "Yes, existence in the impersonal brahman is also within the category of non-Krsna consciousness. Those who are in the brahman effulgence are also in the fallen condition, so there is no question of falling down from a fallen condition. When fall takes place, it means falling down from the non-fallen condition (Goloka-Vrindavana and Vaikuntha). The non-fallen condition is Krsna consciousness.'' (Letter to Revatinandana, LA 13 June, 1970 and 1971 London)

We are all old individual jiva-souls because we have always existed without any beginning point, nor will we ever cease to be as confirmed in Bhagavad Gita As It Is Chapter two teaches.

The individual jiva-souls are eternal spiritual living PERSONS,  as a spiritual bodily form, who can never be destroyed, cut into pieces, terminated or extinguished, the individual jiva-souls are indestructible.

This means there was no beginning to the individual marginal living entities (jiva-souls) existence, nor will there be an end. 

This means there are no new individual jiva-souls ever being created because they have always existed as explained here-

Srila Prabhupada – “There are no new souls, new and old are due to this material body, but the jiva-soul is never born and never dies, so if there is no birth, how can there be new souls?” (Letter to Jagadisa dasa, 9 July 1970)

Bhagavad Gita As It Is - “Never was there a time when I did not exist, nor you, nor all these kings; nor in the future shall any of us cease to be.” (BG, Ch 2 text 12)

Bhagavad Gita As It Is - “As the embodied soul continuously passes, in this body, from boyhood to youth to old age, the soul similarly passes into another body at death. A sober person is not bewildered by such a change." (BG, Ch 2 text 13)

Bhagavad Gita As It Is - “O son of Kuntī, the nonpermanent appearance of happiness and distress, and their disappearance in due course, are like the appearance and disappearance of winter and summer seasons. They arise from sense perception, O scion of Bharata, and one must learn to tolerate them without being disturbed." (BG, Ch 2 text 14)

Bhagavad Gita As It Is - "O best among men [Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation." (BG, Ch 2 text 15)

Bhagavad Gita As It Is - “Those who are seers of the truth have concluded that of the nonexistent [the material body] there is no endurance and of the eternal [the soul] there is no change. This they have concluded by studying the nature of both." (BG, Ch 2 text 16)

Bhagavad Gita As It Is - “That which pervades the entire body you should know to be indestructible. No one is able to destroy that imperishable soul." (BG, Ch 2 text 17)

Bhagavad Gita As It Is - "The material body of the indestructible, immeasurable and eternal living entity is sure to come to an end; therefore, fight, O descendant of Bharata." (BG, Ch 2 text 18)

Bhagavad Gita As It Is - “Neither he who thinks the living entity the slayer nor he who thinks it slain is in knowledge, for the self slays not nor is slain." (BG, Ch 2 text 19)

Bhagavad Gita As It Is - "For the soul there is neither birth nor death at any time. He has not come into being, does not come into being, and will not come into being. He is unborn, eternal, ever-existing and primeval. He is not slain when the body is slain." (BG, Ch 2 text 20 “corrected” 1983 edition)

Bhagavad Gita As It Is - "O Pārtha, how can a person who knows that the soul is indestructible, eternal, unborn and immutable kill anyone or cause anyone to kill?" (BG, Ch 2 text 21)

Bhagavad Gita As It Is - "As a person puts on new garments, giving up old ones, the soul similarly accepts new material bodies, giving up the old and useless ones." (BG, Ch 2 text 22)

Bhagavad Gita As It Is - "The soul can never be cut to pieces by any weapon, nor burned by fire, nor moistened by water, nor withered by the wind." (BG, Ch 2 text 23)

Bhagavad Gita As It Is - "This individual soul is unbreakable and insoluble, and can be neither burned nor dried. He is everlasting, present everywhere, unchangeable, immovable and eternally the same." (BG, Ch 2 text 24)

Bhagavad Gita As It Is - "It is said that the soul is invisible, inconceivable and immutable. Knowing this, you should not grieve for the body." (BG, Ch 2 text 25)

Bhagavad Gita As It Is - "If, however, you think that the soul [or the symptoms of life] is always born and dies forever, you still have no reason to lament, O mighty armed." (BG, Ch 2 text 26)

Bhagavad Gita As It Is - "One who has taken his birth is sure to die, and after death one is sure to take birth again. Therefore, in the unavoidable discharge of your duty, you should not lament." (BG, Ch 2 text 27)

Bhagavad Gita As It Is - "All created beings are unmanifest in their beginning, manifest in their interim state, and unmanifest again when annihilated. So what need is there for lamentation?" (BG, Ch 2 text 28)

Bhagavad Gita As It Is - "Some look on the soul as amazing, some describe him as amazing, and some hear of him as amazing, while others, even after hearing about him, cannot understand him at all." (BG, Ch 2 text 29)

Bhagavad Gita As It Is - "O descendant of Bharata, he who dwells in the material body can never be slain. Therefore, you need not grieve for any living being." (BG, Ch 2 text 30)

The eternal individual jiva-souls can even choose, due to free will, to stay embodied in the temporary decaying material universe's cycles of birth and death, and cycles of material annihilation and creations for an almost infinity, but ultimately it is all temporary.

So the conclusion is, there is no origin to Krsna's individual marginal living energy (an unlimited number of individual jiva-souls), who have existed for as long as Krsna has existed, which is eternity..*..