Religious suffering is, at one and the same time, the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.
Karl MarxRelated topics
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And any religion that professes to be concerned about the souls of men and is not concerned about the slums that cripple the souls-the economic conditions that stagnate the soul and the city governments that may damn the soul-is a dry, dead, do-nothing religion in need of new blood.
Martin Luther King Jr.
All who have actually attained any real religious experience never wrangle over the form in which the different religions are expressed. They know that the soul of all religions is the same and so they have no quarrel with anybody just because he or she does not speak in the same tongue.
Swami Vivekananda