A minister of the Gospel is a man who is always fighting on two fronts. He first of all has to urge people to become interested in doctrine and theology, but he will not have been long at that before he will find that he has to open up a second front, and to tell people that it is not enough to be interested only in doctrine and theology, that there is a danger of becoming a mere orthodox intellectualist and of growing negligent about your own spiritual life and the life of the church. This is the besetting danger of people who hold the Reformed position. They are the only people who are really interested in theology, so the devil comes to them and drives them too far along the line of that interest and they tend to become pure theologians and interested in truth only intellectually.
– Martyn Lloyd-Jones, The Puritans: Their Origins and Successors. Banner of Truth, 1987. pp.8-9.