"A preacher must be able to preach a sermon on faith without ever using the term faith. It is not important that he din the word faith into the ears of his audience, but it is necessary for him to frame his address so as to arouse in every poor sinner the desire to lay the burden of his sins at the feet of the Lord Jesus Christ and say to Him: "Thou art mine, and I am Thine. [...]

"Suppose you were picturing to a horde of Indians theLord Jesus, telling them that He is the Son of God who came down from heaven to redeem men from their sins by taking the wrath of God upon Himself, overcoming death, devil, and hell in their stead and opening heaven to all men, and that every man can now be saved merely accepting what our Lord Jesus Christ has brought to us. Suppose that you were suddenly struck down by the deadly bullet of a hostile Indian lying in ambush. It is possible that, dying, you would leave behind you a small congregation of Indians though you may not even once have pronounced the word faith to them. For every one in that audience who did not wantonly and wilfully resist divine grace would have to reason that he, too, has been redeemed.

"On the other hand, you may spend a lot of time tellingmen that they must believe if they wish to be saved, and your hearers may get the impression that something is required of them which they must do. They will begin to worry whether they will be able to do it, and when they have tried to do it, whether it is exactly the thing that is required of them. Thus you may have preached a great deal about faith without delivering a real sermon on faith. [...] To be saved by faith means to acquiesce in God's plan of salvation by simply accepting it."

-- C.F.W. Walther, "Twenty-Fourth Evening Lecture (April 10, 1885), The Proper Distinction between Law and Gospel