When marketing a diet, exercise program, home gym equipment, or financial strategy, most advertisers use the common disclaimer, "Past success does not guarantee future results". They definitely believe in their product, but can't guarantee that it will work as well for each person.
Unfortunately, we tend to make these assumptions when it comes to our own shortcomings. We say things like "this is how I am," or "there is nothing I can do to change myself." We become so accustomed to our behavior, that we give up on ourselves.
We learn in a Midrash, that if we genuinely try to improve, even I tiny bit (like the whole of a sewing needle), then G-d will expand that to be large enough to allow access to a large wagon. This means that when we take steps in the right direction, we will receive divine assistance to achieve our goal.
As we are in the days between Rosh Hashanah and Yom Kippur, we can become overwhelmed with the thought of upending our lives and perfecting our behavior. If we think of 2 things, we might have a greater chance of success.
Excellence is not supposed to be immediate. As long as we are making a genuine effort, then we can go at a comfortable pace.
No change in behavior or improvement of character is too difficult, because we have the best spotter.