Trader A has a preferred trading style. It might be a momentum style. it might be a directional style. It’s a style that fits Trader A’s personality and that has made money in the past, so Trader A sticks to that style. In sticking to what fits his or her personality, Trader A demonstrates discipline.Trader B has preferred trading “setups”. These are patterns in the market that make the most sense to Trader B. Those patterns might be breakout patterns; they might be patterns of mean reversion. Trader B has seen these patterns work out, so Trader B sticks to trading those setups. In sticking to what fits his or her understanding of the market, Trader B demonstrates discipline.Two traders, Two forms of discipline.Two of those traders are losing money. Are you trading what you subjectively prefer, or are you trading what is objectively present in the market?