Lastly, Here is a demonstration of the absolute necessity of being united to theThomas Boston on The Covenant of Works
Second Adam, who kept the second covenant, and thereby fulfilled the demands of the first covenant. See your absolute need of him; prize him, and flee to him by faith. Behold him with an eye of faith, who has repaired the breach. The first Adam broke the first covenant, by eating of the fruit of the forbidden tree; Christ has repaired the breach, by hanging on a tree, and bearing the curse, for his people. Adam's preposterous love to his wife made him sin: Christ's love to his spouse made him suffer and satisfy. In a garden Adam sinned, and therefore in a garden Christ was buried. Eating ruined man, and by eating he is saved again. By eating the forbidden fruit all died; and by eating Christ's flesh and drinking his blood by faith, the soul gets life again, (John vi. 57). O then have recourse to Christ; and thus shall you be saved from the ruins of the fall, and have an interest in the covenant made with Christ, the condition of which being already fulfilled by him, can never be broken, or they who are once in it ever fall out of it again.