Suppose in your old life you had this sinful habit you didn’t like. But, time and time again, you’d fall into it, then feel bad about it, then beat yourself up, and then get better for a while, only to fall back into it again.
Then, you become a Christian.
But you still struggle with that habit. You fall back into it, just like you used to. And so, you start saying, “See, nothing has changed.” You still feel like you’re in a battle you can’t win.
You may still be in a battle, but you’re wrong if you think nothing has changed. If what Paul says is true (and it is), you’ve gone from a battle you can’t win to a battle you can’t lose.