It is saying that once we can admit that we attracted all the “good” and “bad” things of our past, it gives us control in the present to change the future.
Because if you blamed everything that has happened to you on an external source, then you have NO CONTROL over what happens with your life.
So to get control over your life, you HAVE to admit that you had control over everything that happened in your past but were just not conscious of it or chose not to use it.
Acceptance can be one of the hardest stages of your life. But one you get past it, it opens the doors to infinity.