And don't get me wrong OP, weare not to live as if we have a license to sin. But, if we so slip up and fall into sin(which we are bound to do because the flesh is weak) we will still be forgiven. It is only when he comes back and we are transformed, made perfect in his image, that we will no longer be capable of sin. We will have already expressed our free will and chosen Christ. The battle will be won. No more sin.