Rome was not built in a day. Rome was among the greatest city of the ancient world. But, all on a sudden, the city of Rome did not assume such big shape.
The glory of Rome was raised to such height because several generations of people labored effortlessly for centuries build the empire. Similarly, the massive successes of great people were not attained overnight. All great achievements are the award of years of hard work.
Robert the Bruce learned from a spider that you could win big battles through persistent efforts. One needs to put one brick above another several times to raise a tall building.