The document discusses a mathematical approach to eliminating emotions from trading by focusing on risk versus reward rather than profitable trades percentages. It argues that a strategy with a 50% profitable trades ratio but a risk to reward ratio of 1:1.5 could yield positive returns, while an 85% profitable trades ratio with higher risk and lower rewards could result in smaller or even negative returns. By assessing both risk and reward, traders can better determine a strategy's actual success over time and make objective decisions based on past results rather than emotions. Understanding probabilities and taking a mechanical approach to trading is crucial to managing emotions and achieving long-term trading success.