Daily Luther: How to Make Sure Satan Can’t Sneak In
St. Paul says, we must watch so as not to sin. The world must watch against poverty, against disturbance of the peace, or against enemies, so that all may be well with people and country. But our watching serves to end sin and to prosper and preserve righteousness; it serves the reign of faith and of love and the extermination of unbelief. This demands that we earnestly occupy ourselves with and cultivate God’s Word always and everywhere, snatch it up avidly, hear it, sing it, speak and read it gladly against the despicable satiety and indolence of which I have spoken. Then we will have our castle and fortress well guarded and all holes closed to keep the devil from stealing in. Otherwise, if I or others fail to preach with diligence and if you do not hear it or are practiced in it, imagining that you are well acquainted with it—that is not watching or warding off but slumbering, letting your head droop, indeed, it is snoring right in the midst of the devil’s guns and spears and affording him a good and safe place for breaking in and ascending into the castle without difficulty.
Martin Luther, Luther’s Works, Vol. 28: 1 Corinthians 7, 1 Corinthians 15, Lectures on 1 Timothy, ed. Jaroslav Jan Pelikan, Hilton C. Oswald and Helmut T. Lehmann, 1 Co 15:34 (Saint Louis: Concordia Publishing House, 1999).