Focus is a blade you must sharpen every day.
When I have fallen off my daily writing practice, my blade becomes dull with each passing day. One day missed and the blade cuts the same. Two days missed and the blade begins to catch. Three days missed and the blade is no longer a blade but a saw. Four days missed and the blade begins to slide. In a week's time, the blade does not cut at all and you must start over again from the beginning. Each day, sharpening. Each day, honing. Until the blade is cutting true, as true as it has ever cut before. Then, it becomes about maintenance; daily maintenance. Focus is a blade you must sharpen every day.