Ian Sharman has also just written an excellent post here. I love his bullet about slow finishes rarely caused by going out too slowly! I intend to respond here following SaintElyon to some of the points raised in these two articles.
See here for another excellent word of advice from Ian Sharman regarding effort expenditure.
For what seems to be a good Christian witness in Ultra running, please check out Josh Cox, although I don't know too much about him yet.
As mentioned in Very Useful Links, you really should listen to Talk Ultra by Ian Corless.