“It is better to be roughly right than be precisely wrong”
This is a quote from John Maynard Keynes.
I think what we can learn from this quote is that we don’t have to be right 100% of the times in our trading and investment decisions.
As long as we’re winning and being profitable more times than not, in terms of risk / reward ratio then we can grow our wealth, slowly and surely.
For example even if you have a strategy with a 30% success rate but with a low risk and high reward ratio then you can still be profitable.