* Accessibility: Luther believed that the Bible and church services should be accessible to everyone, not just the clergy and those who could read Latin. He saw the common language as a way to bring people closer to God.
* Translation: Luther himself translated the Bible into German, which was a monumental task and a key step in making the Bible accessible to the common people.
* Reformation Emphasis: The Protestant Reformation, which Luther spearheaded, was partly about simplifying religious practices and removing barriers between people and God. Using the vernacular language in church services was a key element of this simplification.
Luther's work in translating the Bible and promoting German-language church services had a profound impact on the development of German language and culture. It also laid the foundation for the Protestant tradition of emphasizing the Bible as the primary source of religious authority.