I was listening to Joel Beeke explain that Dutch Bibles start the verse numbering with the heading. He accepts that the heading is part of the text which prompted me to check a Jewish copy of the OT and they number the heading as the first verse. This means that Dutch and Jewish verse references can be "plus one" in many psalm references. What is the reason that many reformed folks reject the heading as part of the text? I don't accept "we were told at seminary" or "tradition" as valid arguments? The only grounds I could forsee is a document from antiquity which has no headings with attributions or directions.