The law of the spirit of life in Christ Jesus has set us free from the law of sin and death.
In the Greek the word 'law,' means to self-regulate. There are external laws trying regulate us, i.e. behavior conforming to an outer regulation. In us is the regulating law of Life, that life is the very life of Christ in us the hope of glory.
Here is where things get muddy, meaning, if there is a self-regulating law, (an internal law) one full of Life, why do we need any substitutes or anyone trying to take the place of the spirit of God in directing us?
Isn't it a wonder seeing for i.e. that hidden but ever working law called instinct within the animal world, geese knowing just when to fly south, also the butterflies doing the same, salmon knowing innately when its time to swim up stream to spawn in the very place they were birthed?
How much more of a wonder is it in what Christ has done, putting within man a law of Life that far transcends mere instinct, a self-governing, regulating law, and we are but merely co-operating with that law of Life.
Is it possible to be in that group that according to scripture is, 'ever learning, but never coming to the knowledge of the truth'? Meaning, if there is NO witness of the spirit of God with/in our spirit that we are in fact a child of God, then no matter how much we learn, it will remain in the realm of behavior vs an inner self-regulating law of Life.
Maybe if we knew that we have in fact been certified okay by God himself, that much if not all condemnation most Christians seem to be plagued with would simply be displaced?