Question: Origin of the Soul
What is the origin of the soul? Does it fall down from the brahmajyoti or the spiritual world?
Answer: Krishna is the Origin of the Soul
Since Krishna declares Himself in the Bhagavad-gita to be the origin of everything, we can therefore understand that Krishna is the origin of the individual souls also. And since Krishna eternally exists in the spiritual world and the souls are emanating from His body, we can also understand that the souls are also originally existing in the spiritual world.
In the Krishna Book, Chapter 87 Srila Prabhupada confirms that the living entities fall into the material world from the spiritual world:
"The innumerable living entities are prone to fall down to the material world from the spiritual world when influenced by the illusory energy, and it is also possible for the living entity to be liberated again when by cultivation of real knowledge he becomes completely freed from the contamination of the material world."
Srila Prabhupada explains that there is no question of falling down from the brahmajyoti because being in the brahmajyoti is a fallen position. Those who situated in the brahmajyoti are already fallen. So there is no question of falling down from a position that is already fallen down.