On the way to the moon the Apollo astronauts made tiny "mid-course corrections" than enabled them to land at an exact predetermined spot. The corrections were small, but because the moon was far away they made a big difference. It is like that with us. Some of the changes we make in society, in our lives, or in our organizations seem insignificant, but over the years they can have major impact.
From Productive Workplaces, quoting Edward B. Lindaman and Ronal Lippitt in Choosing the Future You Prefer