"Wherever such witness [to the light and truth of Christ] is borne, there certainly will be some fruit. The witness never fails to effect. Some surely will be reached; some will accept and believe it. Since it is the witness of the Holy Spirit, and the apostle [John] says here, the Spirit beareth witness, he will be effective, producing in us that to which John refers when he says we are children of God, and have the victory and eternal life. So the Word--or the Gospel message accompanied by the witness of the Spirit--and faith are vitally related. In the last analysis they are inseparable." (Martin Luther, Sermon for the Sunday after Easter, I John 5:4-12)
Grant us such faith dear Father in Heaven. Grant us such faithfulness.