Friendship, familiarity, acquaintance, all these are repetitions. Sometimes one feels very uncomfortable in the train finding oneself among people one does not know, but after having seen them for a while one becomes so accustomed to their presence that sympathy awakens and one becomes friends. So the whole life is based upon the principle of repetition. Therefore things that help one to be illuminated and to attain spirituality are prescribed by the wise for repetition.