The spiritual life of pastors
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. You are students of theology; and, just because you are students of theology, it is understood that you are religious men—especially religious men, to whom the cultivation of your religious life is a matter of the profoundest concern. In your case there can be no ‘either-or’ here—either a student or a man of God. You must be both.
– Benjamin B. Warfield