In what is considered the first Protestant textbook concerning Christian apologetics, Hugo Grotius expounds on the nature of God, the existence and personhood of Jesus, and the authority of the New Testament. He discusses Judaism, Islam, and pagan religions, offering refutations of each in light of the internal and external evidence in favor of the Christian faith, declaring it the only sufficient religion. In addition to Grotius’ six-book compilation, two books by editor Jean Le Clerc are included, which provide further commentary on both the nature of Christian sects and indifference toward religion.