'A rolling stone gathers no moss.'
Try as I might I could not remember the meaning. At last I hazarded, 'Well, it means a person who's always active and never pauses to reflect — ' No, that didn't sound right. I tried again. 'That means a man who is always active and keeps growing in mental and moral stature won't grow stale.' He was looking at me more intently, so I added by way of clarification, 'I mean, a man who's active and doesn't let grass grow under his feet, he'll get ahead in life.'
Doctor Nisea said, 'I see.' And I knew that I had revealed, for the purposes of legal diagnosis, a schizophrenic thinking disorder.
'What does it mean?' I asked. 'Did I get it backward?'
'Yes, I'm afraid so. The generally-accepted meaning of the proverb is the opposite of what you've given; it is generally taken to mean that a person who — '
'You don't have to tell me,' I broke in. 'I remember — I really knew it. A person who's unstable will never acquire anything of value.'
Philip K. Dick