I really don't hear that anymore. Trading is not those statements. A trained trader understands success as you lose well and you're wrong small. Trading is called coming out on the small loser's side and being rewarded with knowing how good you have been wrong. It requires a balanced life to sustain the meanness of the markets.
Traders never plan for the bad days and there are bad days.
It is when it affects their lives that they must make a new choice. Either change their behavior or go down in defeat. There's our subject again. POP - Traders have a choice. Either face the truth of trading or look for the nearest exit.