Religious suffering is at once the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature the sentiment of the heartless world as it is the soul of soulless condition. It is the opium of the people.
The restriction of religion to private life therefore does not necessarily threaten the vital interests of the majority religion if there is one and it protects minority religions from tyranny of the majority.
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I read Christopher McDougall's book 'Born to Run.' If running were a religion this would be its bible. I actually scribbled my favorite passages on my arm to read during the race.