There was a time when I took seriously the motto that the OPC stands for the "only perfect church". But I quickly learned that the only perfect church is the church triumphant in glory. But in my early days I enjoyed a fierce denominational loyalty that created in me an attitude of condescension toward others. It is a healthy thing to learn existentially that the holy catholic (universal) church is so much wider than the OPC.
That revelation hit me hardest while I was in Westminster Seminary. You must understand that when I attended Westminster (Philadelphia was the only location of a seminary by that name) the institution was virtually an OPC seminary. Almost every professor was a minister in the OPC (Young, VanTil, Stonehouse, Wooley, Clowney), and that fact tended to encourage my loyalty. It was the student body that opened my eyes to honestly respect other denominations as part of the great body of Christ. My buddy, Rex Boda, was just as loyal as I, but to his denomination, The Christian Missionary Alliance. I found him to be every bit as reformed in his theology as any minister in the OPC. He had a good heart, and a godly walk. Another very intelligent, godly man was in the Mennonite church. Another guy was a Baptist, of all things. They were all good guys with reformed convictions. This experience took the wind out of my sails, the sails that had been full of the wind of denominational snobbery.
Later in life, I joined the Minister's Fellowship in locations where the Lord had placed me. Again I have met good men who shared my convictions about the sovereign grace of God. This is always refreshing and encouraging, but it was far too infrequent.
Have you ever heard a "sermon" that was a series of cute stories, awkwardly tied together with scripture verses? It is no accident of spontaneity. It is calculated. The Minister's Fellowship visited one pastor's study and observed his desk with book holders that propped up the most recent work of his research. I was startled to discover two of them were joke books! You have to know that a Westminster graduate expects to see in-depth reference works and commentaries on a pastor's desk, so you can imagine how jarring this discovery was for me.
I remember the time (early in my ministry) that I had been wrestling with an Old Testament text, and some OPC ministers happened to visit my study during a Presbytery meeting. When they saw a Hebrew Bible and Hebrew lexicon among my books on the desk, I was accused of deliberately setting it up for display. I was insulted. I thought every OPC minister might be found with a similar study condition. I must admit that those books are less frequently found on top of my desk, but then again I have a much smaller desk, and most of it is cluttered with stuff to put away some day. These days, if you know where to go on the web, you can find the Hebrew text and get a lexical reference to the words.