They have no reason to exalt themselves in the least degree; but God is the being whom they should exalt. They should exalt God the Father, who chose them in Christ, who set his love upon them, and gave them salvation, before they were born, and even before the world was. If they inquire, why God set his love on them, and chose them rather than others, if they think they can see any cause out of God, they are greatly mistaken. They should exalt God the Son, who bore their names on his heart, when he came into the world, and hung on the cross, and in whom alone they have righteousness and strength. They should exalt God the Holy Ghost, who of sovereign grace has called them out of darkness into marvellous light; who has by his own immediate and free operation, led them into an understanding of the evil and danger of sin, and brought them off from their own righteousness, and opened their eyes to discover the glory of God, and the wonderful riches of God in Jesus Christ, and has sanctified them, and made them new creatures. When they hear of the wickedness of others, or look upon vicious persons, they should think how wicked they once were, and how much they provoked God, and how they deserved for ever to be left by him to perish in sin, and that it is only sovereign grace which has made the difference. 1 Cor. 6:10. Many sorts of sinners are there enumerated; fornicators, idolaters, adulterers, effeminate, abusers of themselves with mankind. And then in the eleventh verse, the apostle tells them, "Such were some of you; but ye are washed, but ye are sanctified, but ye are justified, in the name of the Lord Jesus, and by the Spirit of our God." The people of God have the greater cause of thankfulness, more reason to love God, who hath bestowed such great and unspeakable mercy upon them of his mere sovereign pleasure.
by Jonathan Edwards - an extract taking from his sermon 'The Sovereignty of God in Salvation'.