Heresy or Secondary Matter

What is a secondary matter, as opposed to a primary matter of the Christian faith? When is a doctrinal difference heresy and when is it something that Christians should be patient with each other about? Is a secondary matter and unimportant thing? Are such matters inconsequential or are they simply something over which we shouldn't break fellowship. In this sermon we consider these complex and practical questions in the hopes of bringing clarity to a subject that often leads to division.