Phil provides a link to an interesting disquisition on the order of the intellectual life. It occurs to me that you can replace 'intellectual life' with 'military life' or almost any other sort of life and find that the same four points hold.
1. Recognize the Intellectual Life as a Calling.Something to consider!
2. Submit Your Intellectual Pursuits to Truth.
3. Understand the Intellectual Life Requires Considerable Discipline.
4. Remember the Goal of the Intellectual Life is Virtuous Character.