English summary: "It is the only good and appropriate of the main gospels and is to be preferred before the other three." ("Das einzige schone, rechte Hauptevangelium und den anderen dreien weit vorzuziehen") - that's how Martin Luther characterises the gospel of John. Today many people can find it difficult to understand or to use its texts for the sermon. This is where this commentary wants to help. By offering an exact and comprehensible...