This excerpt from Note to Self by Joe Thorn says well what's been on my mind lately.
Be Careful in Your Theology
"Keep a close watch on yourself and on the teaching. Persist in this, for by so doing you will save both yourself and your hearers." 1 Timothy 4:16
Your views of God and self are not small ideas of little consequence. You must carefully do the hard work of building a theology that reflects truth. Do not merely settle for the study you have already done. This is more than laziness; it is carelessness with the truth of God. What you have already accomplished is not sufficient to have arrived at a perfect "body of divinity." You need to continue to study and articulate the truth throughout your life. As one who believes that sin has corrupted every faculty of a man, you must acknowledge that if there is corruption in your heart and mind, there is probably some error in your doctrine as well.
Don't settle for the teaching of one teacher or system because you like the leadership there. And do not blindly embrace a tradition because you believe it is simply the closest option out there to what the apostles gave us. While you will do well to listen carefully to those teachers who have gone before you, especially those teachers who consistently preached and taught the whole counsel of God, you must remain careful.
To be careful in your theological development is to be ultimately persuaded of the authority and the sufficiency of Scripture, as well as the worthiness of God. If Scripture is the only perfect and certain word from God, which alone is the flawless revelation of God, then read it, study it, and then articulate the truths it teaches carefully, so as not to misrepresent God or lead people away from the truth.
You do not get to rest just because you believe you chose the right theological tribe. You must continue to exercise due diligence in your investigation and articulation of the truth. By it you will both know God and make him known, or you will misunderstand God and lead others into error."
From Note to Self: The Discipline of Preaching to Yourself by Joe Thorn, page 121.