Is there free will in heaven? But since no sin can be in Heaven, then I don’t see how free will is in Heaven.
To understand eternity, reflect upon the phenomenon of light.
As we know from relativity, light does not experience time. There is no “before” or “after” for light.
We, being within time, perceive concepts of “before” or “after” related to light, but from the perspective of the light itself (or anything moving at the speed of light, for that matter), such concepts do not exist.
And yet, despite there being no “time” for light, light can still change form. It can split into different colors, slowed down in different media, be absorbed and re-emitted.
So now you have insight into the nature of eternity. Despite being in an Eternal Now, with no before or after, change can still take place. One can be in heaven “in eternity” (outside of time), and yet
not be in heaven “forever” (within time). So the angels can fall, but also rise.
This is why, when Jacob lay down with his head upon the stone, and beheld a ladder, he saw “the angels of God ascending and descending on it.” (Genesis 28:12)
So yes, there is free will in heaven, but do not abuse it! Existing in eternity does
not mean inability to change.