God made choice of Abram, and singled him out from among his fellow-idolaters, that he might reserve a people for himself, among whom his true worship might be maintained till the coming of Christ. From henceforward Abram and his seed are almost the only subject of the history in the Bible. Abram was tried whether he loved God better than all, and whether he could willingly leave all to go with God. His kindred and his father's house were a constant temptation to him, he could not continue among them without danger of being infected by them. Those who leave their sins, and turn to God, will be unspeakable gainers by the change. The command God gave to Abram, is much the same with the gospel call, for natural affection must give way to Divine grace. Sin, and all the occasions of it, must be forsaken; particularly bad company. Here are many great and precious promises. All God's precepts are attended with promises to the obedient. 1. I will make of thee a great nation. When God took Abram from his own people, he promised to make him the head of another people. 2. I will bless thee. Obedient believers shall be sure to inherit the blessing. 3. I will make thy name great. The name of obedient believers shall certainly be made great. 4. Thou shalt be a blessing. Good men are the blessings of their country. 5. I will bless them that bless thee, and curse him that curseth thee. God will take care that none are losers, by any service done for his people. 6. In thee shall all the families of the earth be blessed. Jesus Christ is the great blessing of the world, the greatest that ever the world possessed. All the true blessedness the world is now, or ever shall be possessed of, is owing to Abram and his posterity. Through them we have a Bible, a Saviour, and a gospel. They are the stock on which the Christian church is grafted.
There are high declarations of God's favour to Abraham in this confirmation of the covenant with him, exceeding any he had yet been blessed with. Those that are willing to part with any thing for God, shall have it made up to them with unspeakable advantage. The promise, verse 18, doubtless points at the Messiah, and the grace of the gospel. Hereby we know the loving-kindness of God our Saviour towards sinful man, in that he hath not withheld his Son, his only Son, from us. Hereby we perceive the love of Christ, in that he gave himself a sacrifice for our sins. Yet he lives, and calls to sinners to come to him, and partake of his blood-bought salvation. He calls to his redeemed people to rejoice in him, and to glorify him. What then shall we render for all his benefits? Let his love constrain us to live not to ourselves, but to Him who died for us, and rose again. Admiring and adoring His grace, let us devote our all to his service, who laid down his life for our salvation. Whatever is dearest to us upon earth is our Isaac. And the only way for us to find comfort in an earthly thing, is to give it by faith into the hands of God. Yet remember that Abraham was not justified by his readiness to obey, but by the infinitely more noble obedience of Jesus Christ; his faith receiving this, relying on this, rejoicing in this, disposed and made him able for such wonderful self-denial and duty.