"Christ knows whether it comes from stupidity or the Spirit, but I for my part am not very much troubled about our cause. Indeed, I am more hopeful than I expected to be. God, who is able to raise the dead, is also able to uphold his cause when it is falling, or to raise it up again when it has fallen, or to move it forward when it is standing. If we are not worthy instruments to accomplish his purpose, he will find others. If we are not strengthened by his promises, where in all the world are the people to whom these promises apply?"
"I simply taught, preached, wrote God's Word: otherwise I did nothing. And when, while I slept, or drank Wittenberg beer with my Philp and my Amsdor, the Word so greatly weakened the papacy that never a Prince or Emperor inflicted such damage upon it. I did nothing. The Word did it all."
The Word of God will do this work. Our task is simply to be like Ezra of old setting our hearts to study the Word, practice it and teach it (Ezra 7:9-10). Then whether flourishing in our hands or simmering, lingering after our apparent defeat, the Word will do this thing.
Jeremiah tells us the Word of God is like a hammer crushing the rock (Jer 23:29). The Word has the necessary power. Our task then is- whether you can handle only a small hammer’s worth or whether you can wield a huge sledge hammer’s worth- take up whatever of the hammer you can and bring it to bear on the rock around you. Compare not your swings with others, simply take what you have to offer and bring it to bear. And do so in faith- for the Word will do this thing! God has promised.
 Martin Luther, Luther: Letters of Spiritual Counsel, Vol. 18 of Library of Christian Classics, ed. Theodore G. Trappert (Philadelphia: Westminster Press, 1955), 146‑7.
 Quoted by John Stott in in Between Two Worlds: The Art of Preaching in the Twentieth Century (Grand Rapids: Eerdmans, 1982), 25.