This is too sound of advice. People create their own cruxes by attaching the integrity of their being to the results of their trading, to the point where the results possess the actions of the trader, within trading and in their daily life.or get a job!
Trading is a tool, you cannot let it possess you. Traders, or entrepreneurs generally follow extremely strict rituals outside of their endeavors to build the necessary structure in their life to allow for the potential chaos of their risky endeavors. The success or failure of a trader is derived more from the inconsistencies of the trader, than the inconsistencies of the market.
You can self talk yourself as much as you want, read mantras and affirmations, however the subconscious will always be there, prodding the back of your neck, the integrity of your rational thought.
"Until you make the unconscious conscious, it will direct your life and you will call it fate." - Carl Jung