Watch John Piper talk about the husband's role in spiritual protection. (This excerpt is from the message, "Lionhearted and Lamblike: The Christian Husband as Head, Part 2.")
Adam, Where Are You? (Sermons) Fathers Who Give Hope (Sermons) He Must Manage His Household Well (Sermons) Husbands Who Love Like Christ and the Wives Who Submit to Them (Sermons) Jesus, Women, and Men (Sermons)