XVII. But if we advert to the four kinds of causes, which the philosophers direct us to consider in the production of effects, we shall find none of them consistent with works in the accomplishment of our salvation. For the Scripture every where proclaims, that the efficient cause of eternal life being procured for us, was the mercy of our heavenly Father, and his gratuitous love towards us; that the material cause is Christ and his obedience, by which he obtained a righteousness for us; and what shall we denominate the formal and instrumental cause, unless it be faith? These three John comprehends in one sentence, when he says, that “God so loved the world that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.”[56] The final cause the apostle declares to be, both the demonstration of the Divine righteousness and the praise of the Divine goodness, in a passage in which he also expressly mentions the other three causes. For this is his language to the Romans: “All have sinned, and come short of the glory of God, being justified freely by his grace:”[57] here we have the original source of our salvation, which is the gratuitous mercy of God towards us. It follows, “through the redemption that is in Christ Jesus:” here we have the matter of our justification. “Through faith in his blood:” here he points out the instrumental cause, by which the righteousness of Christ is revealed to us. Lastly, he subjoins the end of all, when he says, “To declare his righteousness; that he might be just, and the justifier of him which believeth in Jesus.” And to suggest, by the way, that this righteousness consists in reconciliation or propitiation, he expressly asserts that Christ was “set forth to be a propitiation.” So also in the first chapter to the Ephesians, he teaches that we are received into the favour of God through his mere mercy; that it is accomplished by the mediation of Christ; that it is apprehended by faith; and that the end of all is, that the glory of the Divine goodness may be fully displayed.[58] When we see that every part of our salvation is accomplished without us, what reason have we to confide or to glory in our works? Nor can even the most inveterate enemies of Divine grace raise any controversy with us concerning the efficient or the final cause, unless they mean altogether to renounce the authority of the Scripture. Over the material and formal causes they superinduce a false colouring; as if our own works were to share the honour of them with faith and the righteousness of Christ. But this also is contradicted by the Scripture, which affirms that Christ is the sole author of our righteousness and life, and that this blessing of righteousness is enjoyed by faith alone.