It is rare that idiocy, i.e., a lack of cognitive skill, is the reason for failure or frustration in life.  Indeed, an entirely average person has remarkable intellectual resources.  Most often, the problem with adverse life decisions is not impoverished thought, it is the lack of any thinking at all.   Developing the habit of devoted and intense thinking before actions and decisions will allow you to triumph in life.  Alternatively, even a highly gifted person who is well educated, will ultimately misstep if he acts impulsively without thought.