Again, in Acts xv. 8, 9, it is written with reference to us Gentile sinners: "And God which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as He did unto us; and put no difference between us and them, purifying their hearts by faith." Here we see how the guilt is to be removed from the heart, how we can get a clean heart, obtain the forgiveness of our sins,--even by faith in the Lord Jesus. Depending upon the sufferings of the Lord Jesus in the room of sinners, and depending upon His obedience in fulfilling the law of God, His sufferings are considered as endured by us, His obedience as if found in ourselves: in Him (if we believe on Him) we are considered to have hung on the cross, and therefore were punished in Him, on account of which God, though perfectly holy and just, can forgive us our sins for Jesus sake, as well as reckon us righteous, through faith in the Lord Jesus, who in the room of those who believe on Him fulfilled the law of God.
I would here by the way especially warn against one error, which is, that persons say, I can believe that Jesus is the Christ, the Saviour, that through Him alone the forgiveness of sins is to be obtained, and I do depend on Him alone for forgiveness, but I desire to know that He is my Christ, my Saviour, and because I am not sure about that, I can have no peace. Now, the Gospel which is preached in the New Testament is not, you must believe that Jesus of Nazareth is your Christ, your Saviour, but that He is the Christ, the Saviour; and if you believe that, you have a right to look upon Him as your Saviour.
IV. Question. How may I know that I shall be saved?
Answer. "If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thy heart that God hath raised Him from the dead, thou shalt be saved." Rom. x. 9. The point is simply this: Do I confess with my mouth the Lord Jesus? Do I own Him by the confession of my mouth before men, and do I believe in my heart that Jesus of Nazareth who was crucified was not left in the grave, but was raised again by God on the third day? If so, I shall be saved. For while there may be the confession of the Lord Jesus with the month, without the person being finally saved, there does not go along with this the believing in the heart that God has raised Him from the dead, without the person, in whom both are found, being finally saved; for in none but the children of God are these two points found united together. We have here particularly to observe, that it is not written: If thou shalt say that God has raised Him from the dead; but if thou shalt believe in thine heart that God has raised Him from the dead, thou shalt be saved. I have, then, to take God at His word. If I do confess the Lord Jesus with my mouth, and do believe in my heart that God has raised Him from the dead, I shall be saved, though I do not feel it, though I am utterly unworthy of salvation, yea, though I am altogether deserving condemnation. I must not wait till I feel that I shall be saved before I take comfort; but I must believe what God says in this verse, and, out of that, peace and comfort will flow into my soul. Should, however, one or the other of the children of God, believe in his heart the resurrection of the Lord Jesus, if at the same time he has never made confession of the Lord Jesus with his mouth, he cannot be surprised that the assurance about his salvation is wanting to him; yet if both be found in you, my dear reader, God has been gracious to you, you are His child, you shall be saved.
Further, in John iii. 16, it is written: "God so loved the world that He gave His only begotten Son, that whosoever believeth in Him should not perish, but have everlasting life." Notice here in particular: 1. It matters not how great a sinner I am. 2. The promise is positive concerning my salvation, if I believe in the Lord Jesus. 3. I have only to believe in the Lord Jesus. No matter how it may have been with me hitherto; if only now I trust in and depend upon the Lord Jesus for salvation, I shall have everlasting life.
Further, in Acts xvi. 30, 31, it is written: "Sirs, what must I do to be saved? And they said, Believe on the Lord Jesus Christ, and thou shalt be saved."