Success or failure in business is caused more by the mental attitude even than by mental capacities.

Raw ability gets overrated because it is easy to measure. What tends to decide outcomes across years is more boring: whether you keep going after a bad quarter, whether you can hear criticism without collapsing, whether you begin again. Two people with identical skill can end up in very different places on the strength of that alone.

Which is not to say attitude conquers circumstance, since plenty of capable people are ground down by conditions they never chose. Still, the part you influence is worth naming. Ask what you actually do in the week after something fails, and treat that habit as the skill it is.