From the post:
My Reformed friend, can you move among other Christian groups and really enjoy them? Do you admire them? Even if you disagree with them in some ways, do you learn from them? What is the emotional tilt of your heart – toward them or away from them? If your Reformed theology has morphed functionally into Galatian sociology, the remedy is not to abandon your Reformed theology. The remedy is to take your Reformed theology to a deeper level. Let it reduce you to Jesus only. Let it humble you. Let this gracious doctrine make you a fun person to be around. The proof that we are Reformed will be all the wonderful Christians we discover around us who are not Reformed. Amazing people. Heroic people. Blood-bought people. People with whom we are eternally one – in Christ alone.
Be sure to read the whole thing.