Solid doctrine is the treasure of LCMS, but Christ pointed Out that one does not hide the household lamp under a bushel basket, but sets it out on a stand to light the whole abode. There is more to that than just listening to a sermon Sunday after Sunday (which can breed a certain type of false piety). We, as a family, have lived in several places, in different areas of the country, and one common thing we have observed is an insular mindset, which is unwelcoming, and tends to depress receiving new members. What does it matter if you love each other, but not the others who come among you? Didn't Christ say something about that, too?