Old memories - really old - are almost all in the mountain roots where it takes time to dig them out. — Isaac Asimov

The robot has wanted Fallom all along, Janov.

Now the plan was threatend by something more serious than the Mule had ever been. It was to be diverted from a renewal of Empire to something utterly different from anything in history - Galaxia. And he himself had agreed to that. But why? Was there a flaw in the plan? a basic flaw? For one flashing moment, it seemed to Trevize that this flaw did indeed exist and that he knew what it was, that he had known what it was when he made his decision - but the knowledge...if that were what it was...vanished as fast as it came, and left him with nothing.