Luther on the Exclusivity of the Christian Claim

Christ is the only One who descended and then ascended again. And this He did to lead us up with Him.

Yet the world is so blind and stupid that it always seeks and explores other ways. It is gullible and willing to follow where anyone directs and leads it. It will try, and rely on, any method or any work suggested to it. But one thing it cannot do, namely, remain on this one safe way with firm and steadfast faith. And though it hears and is told that Christ is the Way, it adulterates this message and seeks bypaths and other ways. It does not let Him have the exclusive honor; but it usurps part of this for itself, as though it could contribute something and find the way to heaven by itself.

Therefore, even though we adduce these and similar verses, and persuade people to concede that these statements are true, Mr. Smart Aleck comes along; indeed, the devil himself meddles in with his clever reasoning. His purpose is to keep them on the wrong road and to invalidate these beautiful sayings. — Martin Luther

Meanwhile, modern Lutherans like Nadia Bolz-Weber are doing their best to join the Smart Aleck crowd and appease every deviant view.