Vv. 19,21-24 God gave the law to Moses through angels and then Moses gave it to the people. God wanted to teach his people his will, how to live, and expose their sins so they could see their wickedness and wait in anticipation for the Savior to save them from their sins. Understand that the role of the law is to help us to realize our sins so that we can ultimately draw nearer to Christ.
V. 20 Unlike the law, God gave the promise directly to Abraham, without a mediator. This means God alone would carry out our salvation with his sovereign grace. Take heed not to trade this gift of salvation, fulfilled by one God and one mediator, the man Christ Jesus (1 Tim. 2:5) for something of this world.
What lesson is God teaching me?
Vv. 24,25 The purpose of the law is to lead us to Christ. Therefore, if we belong to Christ in faith, there is no reason to be burdened by the law. Now our spiritual walk should be a response of faith in Christ alone and only to Christ, who has saved me. Let us examine ourselves to see whether I am living under his grace or as if still bound under the law.
Vv. 28,29 We are all one in Christ and heirs of the kingdom of God. Look upon other Christians in the same community with this belief.
Let me live a life responding to your grace daily, rather than the law or tradition.