He that believeth and is baptized shall be saved; but he that believeth not shall be damned. – Mark 16:16
One of the simplest declarations of the gospel is, “He that believeth on the Son hath everlasting life;” and one of the last sayings of our Lord Jesus Christ before He went back to heaven was, “He that believeth and is baptized shall be saved.” To believe is to trust; and whosoever trusts Christ Jesus, depends upon the merit of His death, relies upon the excellence of His atoning sacrifice, and proves the reality of His faith by confessing it in the Scriptural way, such a man shall assuredly be saved; and, in order to his being saved, he shall receive the gift of the Holy Ghost by whose almighty power he shall be enabled to conquer the sin that still dwells within him.
Once more, and this is the part of the gospel that is the best of all, in order that you might be able to believe that God can have mercy on the guilty, and in order that you might be saved, God gave His Son, Jesus Christ, to offer a full and complete atonement for sin… According to the righteous law of God, sin must be punished. Conscience tells you that it is not possible that guilt should go without its due penalty. Therefore it was that Jesus came, and bore the dread penalty that was due to sin. The lash of the law must fall on someone, so He bared His shoulders to its terrible blows. The sword of divine justice was unsheathed, and it must smite someone; so Jesus gave His heart to that sword’s point, and quenched the flaming blade in the crimson fountain of His own blood. Now that this has been done, God can be just, and yet the Justifier of everyone who believes in Jesus; and the effect of that atoning sacrifice upon everyone who truly trusts to it is that he finds himself so changed that he hates the sin he formerly loved, he rushes out of the wicked way in which he once delighted, he abhors the thoughts that once charmed him, and he turns to the Saviour whom once he despised. ~ C.H. Spurgeon