When you confidence becomes permanent as what Nodoji said as surely as sun rise and sun set, is when you wake up every day and you are sure you are going to make some profits from the market no matter it turns out, or almost everyday, at least every week.
There is no 'sure', only probabilities. All sure traders are sure losers. Consistently winning traders run on high probabilities, not sureness.
Lets put it in this way, if you have a system that gives you signals that are 95% probability to be winner, then if you enter 10 to 20 trades in a day with the same risk limit, you are surely to have a profitable day. For a single trade, there is only probability, that is correct.
There is no system giving away 95% probability. Probability waxes and wanes with the ebb & flow of market mood. Yesterday's probability wont be today's.
Larry Williams showed one of his systems during a workshop, reported by someone who attended the show, that reached almost 100% wining probability; and there were other evidences that people achieved that kind of performance. Of course you don't expect those people to broadcast their systems.
You probably know that Goldman Sachs only has 1-3 losing days each year these few years. Of course they are in a different game level.
Seriously? You are comparing a single proprietary strategy to a multi-strategy, multi-asset-class, multiple geography market maker? PS. What is this infatuation with high win rates here?