Reformed people tend to be thoughtful. That is, they come to the Bible and they want to use their minds to make sense of it. The best of them want to make sense of all of the Bible and do not pick and choose saying, "I don't like that verse. That sounds like an Arminian verse, so we will set it aside." No! Fix your brain, don't fix the Bible.
The kind of person that is prone to systematize and fit things together, like me, is wired dangerously to begin to idolize the system. I don't want to go here too much, because I think the whiplash starts to swing the other direction, and we minimize the system, thinking, and doctrine to the degree that we start to lose a foothold in the Bible...
So that would be my flag, the danger of intellectualism. And maybe the danger of certain aspects of it becoming so argumentative or defensive that it becomes unnecessarily narrow.
He then reminds us of how we should be doing things:
We should be intellectually and emotionally more engaged with the person of Christ, the person of God—the Trinity—than we are with thinking about him. Thinking about God and engaging with him are inextricably woven together. But the reason you are reading the Bible, and the reason you are framing thoughts about God from the Bible, is to make your way through those thoughts to the real person.