“Therefore, [there is] now no condemnation (no adjudging guilty of wrong) for those who are in Christ Jesus … For the law of the Spirit of life [which is] in Christ Jesus [the law of our new being] has freed me from the law of sin and of death. For God has done what the Law could not do, [its power] being weakened by the flesh [the entire nature of man without the Holy Spirit]. Sending His own Son in the guise of sinful flesh and as an offering for sin, [God] condemned sin in the flesh [subdued, overcame, deprived it of its power over all who accept that sacrifice], so that the righteous and just requirement of the Law might be fully met in us…” Rom 8:1-4
Romans 8 gives us irrefutable proof that justification does NOT come through the law. It clearly says there is something which the law cannot do – namely the abolishing and overcoming of sin. God, on the other hand, was able to accomplish this. He sent His son as an offering for sin, and in this way met every righteous and just requirement of the Law. In other words – there is nothing of the law that is left for us to complete. Every single requirement was met through Jesus’ sacrifice.
In other words, if we now believe in this sacrifice we are completely set free and justified. That is why there is now no more condemnation for us. No one can point a finger at us and tell us we are not righteous or acceptable before God. We can approach Him boldly and without fear. We have been forever freed from the law of sin and death (a strict list of rules which had to be followed in order to not experience wrath and condemnation) to walk in a law of the Spirit of life (which is Jesus and the life in abundance we now have in Him).