Everything that may be said of that kind of work which is the fundamental condition of providing food and the basic means of human progress is true even in a higher sense of work that is done for the protection of man and his civilization. The renunciation of one's own life for the sake of the community is the crowning significance of the idea of all sacrifice. In this way only is it possible to protect what has been built up by man and to assure that this will not be destroyed by the hand of man or of nature.