I do not know a warning that I judge more necessary to be given to those who are called this day, than to charge them not to trade too much with their natural gifts, and abilities, and learning. These are talents in their kind; but it is the Spirit that must manage all that learning they have, or it will prejudice them, and you also. I have known some good men who have been so addicted to their study, that they have thought the last day of the week sufficient to prepare for their ministry, though they employ all the rest of the week in other studies. But you business is to trade with your spiritual abilities... A man may preach a very good sermon, who is otherwise himself; but he will never make a good minister of Jesus Christ, whose mind and heart [are] not always in the work. Spiritual gifts will require continual ruminating on the things of the Gospel in our minds.
Quotes, by John Owen