"Perseverance is not a long race; it is many short races one after another." Walter Elliott
I use to think of achievement as many small steps taken in the same direction. And achieving success is taking many small steps in the RIGHT direction!
You will take some steps forward and some steps back, that is for sure, but if you keep on going in one direction most of the time, and you know that is the right direction. Then you will reach success sooner or later, because the path is not endless.