…But real trouble and woe arise when this invades spiritual affairs and when the devil plants his seed in Christ’s kingdom, so that it takes root both in doctrine and in life. The result in the area of doctrine is this: Although a man may have the assignment and commission from God to preach the Gospel, others arise, even among his pupils, who claim to know it ten times as well as he does. Thus it is the plague and misfortune of the Gospel to have everyone judging it, becoming a doctor of it on his own, and presuming to be a master in doctrine. This is what happened to Moses, when Korah and his mob rebelled against him and said (Num. 16:3): “Why do you exalt yourselves above the people of God? Are they not all holy? Shall God speak only through Moses and Aaron?” And nowadays they say: “Do we not have as much right to have the Spirit and to understand Scripture as others do?” Right away a different doctrine is served up, and sects are started. Then the judging and the criticizing begin, and particularly the shameful slandering, one party venomously accusing and misrepresenting the other, as we are experiencing right now. This brings on the deadly damage of dividing Christendom and undermining pure doctrine everywhere.  (Luther’s Works, v. 21, pages 211-212).