God will always keep His promises. His great plan of redemption of the whole world through the work of Christ Jesus is enacted through covenants. Listen in this sermon from Acts 7:1–8 titled “The God of Covenants” as Dr. Martyn Lloyd-Jones shows how these great redemptive events form the background of the work of Christ. This redemptive work is for the salvation of individuals and was planned before the foundations of the earth to glorify His name. This great and sovereign plan is important because it exalts God and humbles humanity. It was this sovereign call that brought the pagan Abram to come and worship the true God and declared him righteous. God has planned both the beginning and the end of all things, and He works in history to bring about His plan. Christians should rest in this great truth; God’s plan will be brought to pass. In this outworking of God’s great plan of salvation, He chooses to make covenants with humanity. He made a covenant with Noah after the flood and promised He would not flood the world again. He made a covenant with Abraham and gave Him the sign of circumcision. It is Jesus who came and brought a new covenant, the fulfillment of all God’s promises. It is this great truth that the early church proclaimed. It is salvation in Christ as the fulfillment of God’s great plan.

http://www.mljtrust.org/sermons/the-god-of-covenants/