The answer to your question about the marginal energy...

Expressions researched:
"The answer to your question about the marginal energy"

1968 Correspondence

Is that the jiva soul is always called marginal energy whether he is in the spiritual world or in the material world. There are instances where marginal energy jiva souls have fallen from the spiritual world, just like Jaya and Vijaya. So the potency to fall under the influence of the lower energy is always there. And thus the individual jiva soul is called as Krishna's marginal energy.

Letter to Rayarama -- Los Angeles 2 December, 1968:

The answer to your question about the marginal energy is that the jiva soul is always called marginal energy whether he is in the spiritual world or in the material world. There are instances where marginal energy jiva souls have fallen from the spiritual world, just like Jaya and Vijaya. So the potency to fall under the influence of the lower energy is always there. And thus the individual jiva soul is called as Krishna's marginal energy.