Source for parable about two twins in the womb

Question

I once heard/read a parable about two babies in their mother's womb. It goes something like this.

Two twins in the womb are speaking of the world to come, one believes it exists, the other not. Suddenly a hole appears with light, one of the babies is sucked outside, the other hears agitation, shouting, cries and thinks "I was right, it is over".

For the baby that came out, a new world opens up. Whatever "worked" in the womb is suddenly completely different: he breathes differently, eats differently, moves differently but of course the "new world" is much more interesting.

This is of course a parable for the world to come, which will be much more interesting while being completely different.

Does anyone know the source of this parable? I thought it was from the Rambam or Ramban but never found it. The Gesher HaChaim (vol. 3, p. 28 in the English translation) mentions it without source. Someone else suggested it might be from the Ramchal.

Answer 1

Years later, I found a somewhat similar story quoted in R Akiva Tatz's Anatomy of a search.

After checking with him, he pointed to More Nevuchim 2:17 as his source. It is not exactly the story in the question but close enough to have formed the basis for a "modernization" of the mashal.