Knowing that the sins that we are carrying around in our flesh can lead into our faithfulness in God through the cross, proves the truth and heart of God, just as it is our salvation from our sins that leads into His fullness. And that is what Christ proves through our weakness, and outward rotting. This is why both merely trying to be convinced that we are sinners, or attempting to stay away from what people think are the really bad sins, still do not lead into the straight and narrow gate of God's kingdom. The phrase "giving the flesh over to death" just as Jesus also willingly laid down His flesh, as it became sin and died, means that we still remain on the path of God, even though attempting to receive His Promises will put us in a position for darkness and sin to resist us, and have sin manifest even more so, then if we just attempted to walk, as if staying away from what people call bad sins, or being a friend to the world. It is the truth of what it means to not love the world or be a friend to it, which is the biggest factor that gives sin and darkness to resist the Promises, truth, Spirit, and path of God. This is because the powers and principalities are governing the world, and they can tell when someone isn't walking with them. And therefore the world rejects what walks in Christ, and it is impossible for the world to walk in Christ, or for what is of Christ to walk in the world. And this is the straight and narrow path that comes forth, in entering into God's oneness, which is the goal of His Promises, truth, Spirit, and path. So Paul tells us in Galatians to not become weary, right after he spoke about not following the Law. This is true, just as the Law can give temporary goodness and ability, and was meant for that, until the fullness in Christ came.