Defense is proper and necessary because in every age historic Christianity will be under attack. Defense does not mean being on the defensive. One must not be embarrassed about the use of the word defense. The proponents of any position who are alive to their own generation must give a sufficient answer for it when questions are raised about it. Thus, the word defense is not used here in a negative sense, because in any conversation, in any communication which is really dialogue, answers must be given to objections raised. Such answers are necessary in the first place for myself as a Christian if I am going to maintain my intellectual integrity, and if I am to keep united my personal, devotional and intellectual life.
– Francis Schaeffer