I would commend B.B. Warfield’s booklet, “The Religious Life of Theological Students” to every man in seminary. Warfield assumes the necessity of intellectual growth for competent ministry but he emphasizes the indispensible characteristic of a godly life. This booklet was originally the content of an address by Dr. Warfield at the Autumn Conference at Princeton Theological Seminary, on October 4, 1911. Here’s one of his many outstanding exhortations,
A minister must be learned, on pain of being utterly incompetent for his work. But before and above being learned, a minister must be godly.
Nothing could be more fatal, however, than to set these two things over against one another. Recruiting officers do not dispute whether it is better for soldiers to have a right leg or a left leg: soldiers should have both legs . . . In your case there can be no ‘either–or’ here–either a student or a man of God. You must be both.