Faith, thus receiving and resting on Christ and his righteousness, is the alone instrument of justification: yet is it not alone in the person justified, but is ever accompanied with all other saving graces, and is no dead faith, but worketh by love. Westminster Confession of Faith 11.2
I like Turretin’s illustration about the eye as the lone instrumental means of sight for the body. The word “lone” in this context doesn’t meant that eye must be ripped out of the body and isolated in order for it to function as the lone instrumental means of sight. The functioning eye always remains in its organic connection with the rest of the body. Yet there is no other member in the body which sees, and that is the sense in which the eye is the lone instrumental means of sight. The same is true of faith as the lone instrumental means of justification. Faith never exists torn from its organic relationship with its fruits, but the fruits are not instrumental means of justification.
The fruit comes from the Christ our faith unites us to, not from the faith itself. Faith is the branch’s abiding in the Vine in a vital, effective sense. From the perspective of divine sovereignty, faith is our experience of the mystical union with Christ effected and maintained by the baptizing work of the Holy Spirit. From the perspective of human responsibility, saving faith is our duty and something we do.
Every creature lives in terms of faith because of his creaturely limitations. Faith is the evidence of things not seen, and only God sees everything. In eternity, we will live by sight and not by faith, but that is a relative statement, not an absolute statement. We will see much in eternity that is invisible to us now, but we won’t then see everything. Even in eternity, we will be creatures with limited knowledge and thus beings of faith.
The distinguishing factor in saving faith is its object, which is Christ. Apart from any psychological effect, the effectiveness of faith is based on its object, not its subjective strength. A weak faith in a reliable object is effective, and a strong faith in an unreliable object is not. See the sermon, “Sola Fide: The Alone Instrument of Justification” at http://grovergunn.net/andrew/gal307.pdf.
Posted in Salvation, Sola Fide | Tags: Federal Vision, Salvation, Sola Fide