Final answer:
The Schleitheim Confession has an anabaptist voice representing a sect that favored a radical and separate church, whereas Luther's works speak from a perspective of reform within the broader Christian church.
Step-by-step explanation:
The Schleitheim Confession has an anabaptist voice while Luther's works do not. The Schleitheim Confession was a statement of faith by the Swiss Brethren, an Anabaptist group, in 1527. It represented a sectarian, radical, and voluntary church concept, which differed from Martin Luther's perspective and the mainstream Protestant Reformation. Luther's works are characterized by their focus on justification by faith and a reform within the existing church structure rather than a complete separation. The voices of the two are distinct in that the Schleitheim Confession speaks from a minority, separatist position, while Luther's works articulate a view intended to be more universally applicable within Christianity at large.