Thanks to Matt Mitchell who inserted Ray Ortlund Jr's insightful and convicting post from Ortlund's blog in the comment section to my previous post. Yes, you can go there and read it, but I want to highlight an excerpt here. After several paragraphs considering "Galatianism," Ortlund writes,

Whatever divides us emotionally from other Bible-believing, Christ-honoring Christians is a “plus” we’re adding to the gospel. It is the Galatian impulse of self-exaltation. It can even become a club with which we bash other Christians, at least in our thoughts, to punish, to exclude and to force into line with us.

What unifies the church is the gospel. What defines the gospel is the Bible. What interprets the Bible correctly is a hermeneutic centered on Jesus Christ crucified, the all-sufficient Savior of sinners, who gives himself away on terms of radical grace to all alike. What proves that that gospel hermeneutic has captured our hearts is that we are not looking down on other believers but lifting them up, not seeing ourselves as better but grateful for their contribution to the cause, not standing aloof but embracing them freely, not wishing they would become like us but serving them in love (Galatians 5:13).

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.