The Defense of the Faith is Van Til’s book about the subject for which he is most famous, presuppositional apologetics. I know many Christians wish to be able to defend their faith and to be “prepared to give an answer to everyone who asks you to give the reason for the hope” that they have (I Peter 3:15). … “Presuppositional” means that the argument for the truth of the claims of Scripture focuses on the presuppositions, or assumptions, of non-Christian thought, and it is founded on and proceeds according to the presuppositions of Biblical, Christian thought. The most foundational idea of non-Christian thought is the idea of human autonomy. According to the Bible, the unbeliever’s heart is naturally at war with God after the fall. God has revealed that He is the Creator, and that man, whether he wants to or not, must always ultimately face the fact the he is the creature, and is responsible to and dependent on God. He knows that this is true. However, after the fall, the unbeliever does not want to be responsible to or dependent on God. He suppresses the truth that he knows in unrighteousness (Rom. 1:21). He wants to determine for himself the significance and purpose of his life. He makes his own mind the ultimate criterion for all interpretation and for all activity. The claims of God are not satisfactory to him, so he rejects them. The mind of the creature sits in judgment over its Creator. Thus all human reasoning and interpretation is inescapably and fundamentally ethical by nature. Van Til’s argument is that a truly Biblical apologetic must confront the unbeliever at this very point. … ~ B.C. Richards at Amazon.com