Read the document
Melanchthon, opinion on the king of England's cause · August 1531; Corpus Reformatorum II
Summarized rather than quoted: before approving divorce from Catherine, Melanchthon holds it safer for the king to take a second queen, polygamy being no violation of divine law.
Luther, letter to Robert Barnes · September 3, 1531; De Wette IV
Summarized rather than quoted: Luther would sooner allow the king two queens than sanction the divorce.
Put it in context
Henry VIII's divorce was one of the defining marriage disputes of the age, and the reformers considered it in private written opinions. Their advice distinguishes what they believed divine law prohibited from what they thought prudent or publicly teachable.
The documents are private political counsel rather than church confessions, which limits what they can prove about general Reformation doctrine.
What is disputed
This is private political counsel on a dynastic crisis, not a general doctrinal statement, and reading it as the latter is disputed. The surrounding reasoning matters as much as the favorable sentence.
How I read this record
This is my conclusion from the source, not part of the quotation.
In private counsel on Henry VIII's case, Melanchthon and Luther preferred a second wife to divorce because they did not understand divine law to forbid the former. That does not make the advice a public doctrine, but it is part of their recorded reasoning.
Open the sources
- Corpus Reformatorum (Melanchthon's works) at archive.org ↗ · The 1531 English-cause opinions in volume II.