Grace is the very essence of the Gospel—the only hope for fallen men, the sole comfort of saints passing through much tribulation on their way to the kingdom of God. The Gospel is the announcement that God is prepared to deal with guilty rebels on the ground of free favour, of pure benignity; that God will blot out sin, cover the believing sinner with a robe of spotless righteousness, and receive him as an accepted son: not on account of anything he has done or ever will do, but of sovereign mercy, acting independently of the sinner's own character and deservings of eternal punishment. Justification is perfectly gratuitous so far as we are concerned, nothing being required of us in order to it, either in the way of price and satisfaction or preparation and meetness. We have not the slightest degree of merit to offer as the ground of our acceptance, and therefore if God ever does accept us it must be out of unmingled grace.
...“Being justified without a cause by His Grace.” How this tells out the very heart of God! While there was no motive to move Him, outside of Himself, there was one inside Himself; while there was nothing in us to impel God to justify us, His own grace moved Him, so that He devised a way whereby His wondrous love could have vent and flow forth to the chief of sinners, the vilest of rebels. As it is written, “I, even I, am He that blotteth out thy transgressions for Mine own sake, and will not remember thy sins” (Isa. 43:25). Wondrous, matchless grace! We cannot for a moment look outside the grace of God for any motive or reason why He should ever have noticed us, still less had respect unto such ungodly wretches.
...The first moving cause, then, that inclined God to show mercy to His people in their undone and lost condition, was His own wondrous grace—unsought, uninfluenced, unmerited by us. He might justly have left us all obnoxious to the curse of His Law, without providing any Surety for us, as He did the fallen angels; but such was His grace toward us that “He spared not His own Son.” “Not by works of righteousness which we have done, but according to His mercy He saved us, by the washing of regeneration, and renewing of the Holy Ghost; Which He shed on us abundantly through Jesus Christ our Saviour; That being justified by His grace, we should be made heirs according to the hope of eternal life” (Titus 3:5–7). It was His own sovereign favour and good will which actuated God to form this wondrous scheme and method of justification.
...Toward the sinner justification is an act of free unmerited favour; but toward Christ, as a sinner's Surety, it is an act of justice that eternal life should be bestowed upon those for whom His meritorious satisfaction was made. First, it was pure grace that God was willing to accept satisfaction from the hands of a surety. He might have exacted the debt from us in our own persons, and then our condition had been equally miserable as that of the fallen angels, for whom no mediator was provided. Second, it was wondrous grace that God Himself provided a Surety for us, which we could not have done. The only creatures who are capable of performing perfect obedience are the holy angels, yet none of them could have assumed and met our obligations, for they are not akin to us, possessing not human nature, and therefore incapable of dying. Even had an angel became incarnate, his obedience to the law could not have availed for the whole of God's elect, for it would not have possessed infinite value.
None but a Divine person taking human nature into union with Himself could present unto God a satisfaction adequate for the redemption of His people. And it was impossible for men to have found out that Mediator and Surety: it must have its first rise in God, and not from us: it was He that “found” a ransom (Job 33:24) and laid help upon One that is “mighty” (Ps. 89:19). In the last place, it was amazing grace that the Son was willing to perform such a work for us, without whose consent the justice of God could not have exacted the debt from Him. And His grace is the most eminent in that He knew beforehand all the unspeakable humiliation and unparalleled suffering which He would encounter in the discharge of this work, yet that did not deter Him; nor was He unapprised of the character of those for whom He did it—the guilty, the ungodly, the hell-deserving; yet He shrank not back.“O to grace how great a debtor,Daily I'm constrained to be!Let Thy grace, Lord, like a fetter,Bind my wandering heart to Thee.” -A.W. Pink