The main reason why so many gracious souls are so full of fears, doubts, darkness, and disputes about their internal and eternal estates, is because they have no more clear and full understanding of these two covenants, the covenant of grace and the covenant of redemption; and if such Christians would but more seriously buckle down to the study of those two covenants, as they are opened and applied in the following treatise, their fears and doubts, etc., would quickly vanish. Neither do I know anything in all this world that would contribute more to seriousness, spiritualness, heavenliness, humbleness, holiness, and fruitfulness, than a right understanding of these two covenants, and a divine improvement of them. There are many choice Christians who have always either tears in their eyes, complaints in their mouths, or sighs in their breasts; and oh that these, above all others, would make these two covenants their daily companions! Let these few hints suffice concerning the following treatise. Now the God of all grace fill both your hearts with all the fruits of righteousness and holiness, and greatly bless you both with all spiritual blessings in heavenly places, and make you meet-helps to each other heaven-ward, and at last crown you both with ineffable glory in the life to come! 1 Pet. 5:1; Gal. 5:22-23; Eph. 1:3.