In the first chapters of this book it is the purpose to demonstrate that the spirit of sacrifice is the essence of the Christian life; an assertion the truth of which the author imagines is not possible to question for a moment. If that assertion is incontestable, even self-evident, it will be seen that the closest relations exist between the victim's spirit of sacrifice and the religious life, since, if the spirit of sacrifice is the foundation and essential characteristic of the Christian life, the religious life, which aspires to the attainment of the greatest perfection of the Christian life ought to aim at attaining the perfection of a victim's life of self-surrender.