Once sure that the doctrine we teach is God's Word, once certain of this, we may build thereupon, and know that this cause shall and must remain; the devil shall not be able to overthrow it, much less the world be able to uproot it, how fiercely soever it rage.
Martin LutherThe certain mark by which a Christian community can be recognized is the preaching of the gospel in its purity.
Martin LutherWhen Satan tells me I am a sinner he comforts me immeasurably, since Christ died for sinners.
Martin Luther