It may also mean that if you 'assume' the market the way you assume everything else you would be a negative performer.
Probably most of you are.
Are what?
Yes, you saw it right, negative performers.
Traders never blame anyone else nor try to hide under 'mommas' skirts when they fail. Traders just throw failed trades behind their backs into the pile of 'expericence' and go for the next trade with more wisdom. Or they are simply jealous wannabes.