Let me begin on a somewhat personal note. In the days when I grew up in New York and New England, I seem to have been surrounded by Protestants of many species, Episcopalian, Presbyterian, Methodist, Congregationalist, and others. Occasionally I ran into a Roman Catholic, but almost no one I knew was a Lutheran. Luther for me was a figure in history books. Only in the Navy during World War II did I come to know a Lutheran really well, and since he was a devout student of the Bible and of theology, the two of us had an excellent theological dialogue. But again after that, during my theological studies, Lutheranism became for me a purely academic matter.
Dullee, Avery, "The Lutheran-Catholic Dialogue: The Year 1980" (1981). Institute of Liturgical Studies Occasional Papers. Paper 15.