These purely destructive tactics, the danger of which is so readily perceived by the enemy that he forms a united front against them for his common defence, and also the constructive tactics, which must be aggressive in order to carry the new world of ideas to success--both these phases of the struggle call for a body of resolute fighters. Any new philosophy of life will bring its ideas to victory only if the most courageous and active elements of its epoch and its people are enrolled under its standards and grouped firmly together in a powerful fighting organization. To achieve this purpose it is absolutely necessary to select from the general system of doctrine a certain number of ideas which will appeal to such individuals and which, once they are expressed in a precise and clear-cut form, will serve as articles of faith for a