Nature has made no two human beings alike. However much he may share his views and life with another person, each man will have his own individual differences in thought and conduct. Hence attractions and repulsions, frictions, and misunderstandings will sooner or later arise between men. Perfect harmony with everybody and in everything on this earth is an unrealizable dream.
-- Notebooks Category 13: Human Experience > Chapter 2: Living in The World > # 413