Compare this:
Efficiency is not your friend when it comes to cognitive growth. In order to keep your brain making new connections and keeping them active, you need to keep moving on to another challenging activity as soon as you reach the point of mastery in the one you are engaging in. You want to be in a constant state of slight discomfort, struggling to barely achieve whatever it is you are trying to do, as Einstein alluded to in his quote. This keeps your brain on its toes, so to speak.
With: The proper role for your pre-frontal cortex is to decide what behavior you want to change, design the ritual you'll undertake, and then get out of the way. "It is a profoundly erroneous truism that we should cultivate the habit of thinking of what we are doing," the philosopher A.N. Whitehead explained back in 1911. "The precise opposite is the case. Civilization advances by extending the number of operations we can perform without thinking about them."
Is there a real contradiction? If yes, is there any point to intelligence if you get less important things done?