Collins asks people to imagine a massive metal flywheel, a heavy disc on an axle. At the start, it takes enormous effort to move it even slightly. But with consistent pushing, it slowly begins to turn. Over time, the momentum builds. Eventually the flywheel is spinning so fast that it generates its own energy. This is what sustained great performance actually looks like. From the outside, when a good-to-great company was finally recognised as exceptional, it looked like a sudden breakthrough. People searched for the defining moment, the genius decision, the transformative initiative that launched the company into greatness. But the people inside the company could not identify such a moment. There was no single launch. There was no miracle. There was just the consistent push of the flywheel: good decisions, well executed, compounding over time. This has two important implications. First, do not wait for the big moment or the breakthrough idea. Consistent action in the right direction, repeated over time, is what produces exceptional results. Second, do not expect others to immediately recognise what you are building. The flywheel turns slowly at first. The momentum is invisible until it is not. Keep pushing. Collins also identifies what he calls the doom loop: the pattern of companies that keep changing direction, lurching from strategy to strategy, never allowing the flywheel to build momentum. Each change resets the wheel to zero. Sustained greatness requires sustained direction, not constant reinvention.