John Piper gives a compelling reason for rigorous training of the mind. A quote:
The issue of earning a living is not nearly so important as whether the next generation has direct access to the meaning of the Word of God. We need an education that puts the highest premium under God on knowing the meaning of God’s Book, and growing in the abilities that will unlock its riches for a lifetime. It would be better to starve for lack of food than to fail to grasp the meaning of the book of Romans.