Now, brethren, it is in such trying circumstances as these [a soul crying, "What must I do to be saved?"], that the Spirit of grace, in His own peculiar light, unfolds the mystery of Christ’s substitution.
We may illustrate this point by a very simple comparison. Suppose that one of you were drowned in debt, had nothing to pay, became utterly bankrupt, and were about to have all your goods sold, your family cast on the world, and yourselves thrown into prison; and that, in this state of matters, a benevolent and wealthy individual stepped forward and said, I will go into his shoes I will be the debtor let him go free; and that the creditor, assured of his excellence, and wealth, and liberality, accepted of the offer you would watch with interest what followed, nor would you be content till the discharge from all obligation were put into your hands.
Now we have shown that the case of sinners (and when we say sinners we mean every man, woman and child in this assembly in their natural state) is very similar to this.
And what is to be done?
It is out of the question for you to discharge the debt; one single sin is sufficient to send you into eternal banishment from God and the glory of His power; and though you were to labour for a thousand years, with all the might you possess and all the means you can obtain, you could not produce one act of obedience to the law, but must, in your very efforts, be sinking deeper and deeper every hour into guilt and ruin, for the “law worketh wrath”; and “as many as are of the works of the law are under the curse.”
But, in this condition, the Son of God incarnate, in glory ineffable, with riches unsearchable, from love unspeakable, steps forward and says to the Father the God whom sinners have offended, and at whose hand they deserve nothing but wrath to the uttermost, “I will go into their room. Let all their sins be laid upon Me; I will bear them. Let all their obedience be upon Me; I will render it. Let all their concerns be upon Me; I will manage them.”
The Father loves the Son; He knows His worth, His sufficiency, His grace; and He accepts Him as the substitute of poor, bankrupt, perishing sinners.
“Sacrifice and offering Thou didst not desire. Then said I, Lo, I come: in the volume of the book it is written of Me, I delight to do Thy will, O My God; yea. Thy law is within My heart.”
From Jonathan R. Anderson’s – The Spirit of Grace and Supplication.