First of all, I don't think 'top traders' have many beliefs about the market itself. They recognize the unpredictable nature of price action, and have conditioned themselves to react to what they see the market do, rather than have an opinion about what it should be doing.
Instead, I think 'top traders' have many more beliefs about themselves and their chosen method of trading. A few might be:
They believe they have a profitable method that fits them.
They believe they have the discipline to follow their method
They believe that, while they will have losing trades regularly, these are a necessary part of trading and if they stick to their method they will always be able to be profitable in the long run.
They believe in their discipline to not trade larger, or more frequently than their method dictates. This protects their most precious resource: their capital
They believe that the market is a force to be used, not fought.