It’s very important to understand that the Old Covenant Law was temporary. The law is not God’s character revealed and engraved on stone and therefore permanent. No, it had a shelf life. Notice in verse 19: “…It [the Law] was added because of transgressions until the Seed to whom the promise referred had come.” “Added”, “until”. It just means that it was temporary. The Law was added at Mt Sinai and was only in place until Jesus died on the cross at which time the Old Covenant died and a New Covenant made. …”The law engraved on stone tablets was ground to powder at the cross.” [Spurgeon] The law is no longer the power of sin for us. It no longer condemns us because it condemned Jesus in our place. And when Jesus died, it died and we are free.