So that all the covenant that believers are to have regard to, for life and salvation, is the free and gracious covenant that is betwixt Christ [or God in Christ] and them. And in this covenant there is not any condition or law to be performed on man's part, by himself; no, there is no more for him to do, but only to know and believe that Christ hath done all for him. Wherefore my dear Neophytus [a new Christian], to turn my speech particularly to you, [because I see you are in heaviness,] I beseech you to be persuaded that here you are to work nothing, here you are to do nothing, here you are to render nothing unto God, but only to receive the treasure, which is Jesus Christ, and apprehend him in your heart by faith, although you be never so great a sinner; and so shall you obtain forgiveness of sins, righteousness, and eternal happiness; not as an agent but as a patient, not by doing, but by receiving. Nothing here comes betwixt but faith only, apprehending Christ in the promise. This, then, is perfect righteousness, to hear nothing, to know nothing, to do nothing of the law of works; but only to know and believe that Jesus Christ is now gone to the Father, and sitteth at his right hand, not as a judge, but is made unto you of God, wisdom, righteousness, sanctification, and redemption. Wherefore, as Paul and Silas said to the jailer, so say I unto you, "Believe on the Lord Jesus Christ, and thou shalt be saved"; that is, be verily persuaded in your heart that Jesus Christ is yours, and that you shall have life and salvation by him; that whatsoever Christ did for the redemption of mankind, he did it for you.
Fisher, Edward. The Marrow of Modern Divinity