"A disciple is a student of Christ -someone who spends time with the Savior in order to come to know him better and resemble him more closely. As a pastor, I have found that many Christians simply assume that learning more and more about Bible and theology -Reformed theology in particular- is the same thing as growing as a disciple. It isn't. Robust theology can be a powerful catalyst in this process, but like anything else, we can turn it into an idol. The danger is that, while we may begin with Reformed theology as the framework by which we more coherently understand and appreciate our faith, over time it can become the substance of our faith. At that point, daily living is more about mastering Reformed doctrine than being mastered by Jesus and his total claim over every area of life.
When does one's attention to theology become too much? It's not always easy to say...
But we cross the line when we are more focused on mastering theology than on being mastered by Christ."
Greg Dutcher, Killing Calvinism: How to Destroy a Perfectly Good Theology From the Inside