Dr. David Murray, Professor of Old Testament and Practical Theology at Puritan Reformed Theological Seminary, has a blog called Head, Heart, Hand. Dr. Murray is a godly and thoughtful man, who has some edifying and interesting thoughts. You can watch several videos of Dr. Murray speaking on various subjects here.
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naïve. (Romans 16:17-18)