52:6.4

2. Intellectual cross-fertilization. Brotherhood is impossible on a world whose inhabitants are so primitive that they fail to recognize the folly of unmitigated selfishness. There must occur an exchange of national and racial literature. Each race must become familiar with the thought of all races; each nation must know the feelings of all nations. Ignorance breeds suspicion, and suspicion is incompatible with the essential attitude of sympathy and love.