Paul said precisely that too. If you are guided by the Spirit, you are not subject to the Law. Even the beginner in the Faith Christ presented is justified. But if he stops learning and living faithfully, he is no longer justified. Faith calls for faithfulness in continuity.
Faithfulness is the partner of action in cooperation - as is so clearly written in Jam.
The purpose of these acts is to prove the plan works out as advertised. That is to lead into further trust, confidence and reliance on the Faith in the plan of the Father, the Old and New Testament Word of God. The Law was established for guiding spiritual infants, not only in accomplishment but, more importantly, in thinking constructively. All should have moved far enough in understanding and godly wisdom to be freed from infant training, which the ancients needed. Therefore, they are soon to be given another chance to catch up, during The Great Tribulation.