When it has become impossible.
For instance ages ago we got a prophecy that we'd go over the world to share the gospel. That's nonsense. We're divorced. But lately I dreamt for the 2nd time that I was in the car w my dad and he drove. They have to carry him in and out of bed. And I said in the dream: hey I dreamt this! And he said: but it this a dream or is this real? It's real! Normally I realize in my dream that I'm just dreaming. I don't give up on that dream. God still heals. It's perfectly possible.