The reason why "life" (the unlimited existence of eternal individual jiva-souls) can NEVER be generated (created), is because the life force (an unlimited collection of unique indestructible individual jiva-souls) have ALWAYS existed and were NEVER created.

Individual life (the eternal jiva-souls) are beginningless and endless as Bhagavad Gita As It Is explains.

"Life" (the eternal individual jiva-souls) can only be awakened when the jiva-souls have fallen to the dormant (inactive) conditional state in the atom, and the impersonal brahmajyoti.

Such a "fall down" to the dormant (inactive) brahmajyoti, is unnatural for the jiva-souls whose real "nature" is to be fully "active" in Kṛṣṇa's eternal pastimes.

The eternal jiva-souls as individual persons, always have a choice (free will), to remain with Krsna in the spiritual world, or reject Him and enter the temporary material world 

"Life" therefore is never created, not even by Krsna because "life" has ALWAYS existed. 

Once fallen to the material world of repeated birth and death, the eternal individual jiva-souls can become frustrated with that constant suffering of birth, disease, old age and death and fall even further to the dormant (inactive) impersonal brahmajyoti, or can become dormant even in the atom. 

When individual life (the eternal jiva-souls) eventually awakens from their dormant impersonal existence in the brahmajyoti, or the material atom, some jiva-souls will WRONGLY believe life originated or is created (generated) from the an impersonal origin in the brahmajyoti.

However, the individual jiva-souls or life force has only been resting in a dormant inactive condition attained from a previous existence in the material world, a previous material universe long, long, long ago.

Others may also WRONGLY believe the individual life force is an all-one all-pervading energy and only has form or becomes an individual unite when contained in a material bodily vessel, just like water contained in a jar becomes separate from the ocean of water around it by being in the jar.

Their belief is called mayavadi impersonalism because they deny the "life force" is an unlimited collective of unique "individual eternal jiva-souls." 

The individual jiva-souls (marginal living entities) are eternal spiritual living PERSONS who can never be destroyed, terminated, divided into pieces or extinguished. 

The jiva-souls are indestructible and were NEVER created, they have ALWAYS existed like Krsna has always existed.

We are all "old souls" because the individual jiva-souls have perpetually existed and were NEVER created. 

The implications of existing for infinity is mind boggling because this means there is no death for the jiva-souls. 

It is only the outer material bodily containers or vessels that is temporary and eventually decompose (dies) and its material elements merge back into the material energy - the jiva-souls within are indestructible and never die, they are beginningless and endless.

The process of material life (the repeated cycle of birth and death) means the individual jiva-souls move through 8,400,000 species of life (material bodily vessels) in the material world of which the human form only numbers 400,000 and has a minimum expression of free will.

The other 8 million species are lower species where the embodied jiva-souls are trapped in material bodily lower forms who have no free will and only directed by the material bodily instincts of- 

eating,

sleeping,

mating,

defending.

There is no accumulation of Karma (reactions to one's good and bad deeds) in the lower 8 million species or while on the heavenly and hellish planets. 

Karma is only created while in human form in the material world on the middle planetary system known as Bhurloka. The individual jiva-souls burn off their accumulation of past karma (the results of good and bad activity) accumulated in the human bodily form of life.

The important thing to understand is the individual jiva-souls are beginningless and endless just like Kṛṣṇa is.

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)

All individual jīva-souls are ETERNAL  spiritual persons (anti-matter). 

Therefore, there are no new jiva-souls being created because they have ALWAYS existed, meaning the individual jiva-souls are beginningless and endless.

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 9th July 1970)

The jiva-souls are eternal individual spiritual living PERSONS (anti-matter) who can NEVER be destroyed, terminated, divided into pieces or extinguished because they are indestructible will ALWAYS exist for infinity.

The individual jiva-souls can enter or possess and become any material bodily container or vessel they choose over the infinity of its existence, but only temporarily.

This is because all outer material bodies (matter) that covers the eternal individual jiva-souls, eventually breaks down, decomposes (dies) and again merges back into the "oneness" of the material energy that all bodily vessels are made from in the material world. 

However, each eternal individual jiva-soul (anti-matter) can NEVER become another individual jiva-soul, Krsna, Radharani, Visnu, Narayana and their expansions, or Siva and his expansions.^×^.