This rule is, for some reason, easily forgotten or ignored.
You can't be right with your market timing all the time.
If you are wrong, get out.
Listen to that little voice in your head, telling you that you are wrong.
I have heard traders say:
"I know I am wrong" – as they continue to hold on to their position and lose more money.
Most often, they've not accepted the fact that losses will happen.
Meanwhile, new setups with high probability occur continuously.
At the sign of being wrong when your trade reach your stop loss level, get out.
Then look to open a new trade in a setup with a higher probability than your losing position.
“The elements of good trading are: (1) cutting losses, (2) cutting losses, and (3) cutting losses. If you can follow these three rules, you may have a chance.” – Ed Seykota