I love this quote
From Chapter 1 of The Effective Executive, by the godfather of management writing, Peter Drucker:
But there seems to be little correlation between a man’s effectiveness and his intelligence, his imagination, or his knowledge. Brilliant men are often strikingly ineffectual; they fail to realize that the brilliant insight is not by itself achievement. They have never learned that insights become effectiveness only through hard systematic work. Conversely, in every organization there are some highly effective plodders. While others rush around in a frenzy and busyness which very bright people so often confuse with “creativity,” the plodder puts one foot in front of the other and gets there first, like the tortoise in the old fable.