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. Someone told me the Gesher HaChaim (vol. 2, p. 171) mentions it without source. Someone else suggested it might be from the Ramchal.