The whole battle is over a hairsbreadth. In other words, If someone wants to be victorious all in one go, it's impossible. But if all you have to do each time is move one hairsbreadth forward, you can! All you have to do is take a little step from bad to good.
As I was watching the Olympics this year this quote came back to my mind. Almost all of the games are measured down to the 1/100 of a second or 1/100 of a point. In the fastest game in the Olympics, the luge, it is measured down to 1/1000 of a second which on the ice comes down to a mere 1/4 of an inch. The games are so competitive that the difference between gold and bronze is often no more than the blink of an eye, literally, a split second.
These Olympians train for four years, morning, noon and night. They eat, sleep and breathe their sport in order to improve by just "a hairsbreadth".