In the first millennium of Christian history, the foundations of Christendom were laid by Christian princes, who created the European nations while offering us an example of how the world can be made Christian without Christians becoming worldly. History, the great teacher of Christian life and faith, instructs us by the example of the martyrs, how the truth is not negotiable and must be witnessed - if necessary, to the shedding of one's blood. History edifies us with the example of the Crusaders, ignoring the trials that they would undergo and offering their lives for the Church. It reminds us, by the example of monks and hermits, that the rejection of the world and attachment to God alone, in silence and prayer, are the means to satisfy those who are called to this constant union with God. It teaches us, by the work of the apologists, how the apostolate is exercised not only by exposing the faith, but also by vigorously refuting prejudices and errors.