I had lots of these "person I know is smart but sucks at <school/work/relationships/life/etc.>" chats with my father while growing up. My father always respond

I had lots of these "person I know is smart but sucks at <school/work/relationships/life/etc.>" chats with my father while growing up. My father always responded, "if they were so smart, why didn't they just use their intelligence to figure out how to succeed at those things?"