According to Karl Marx,how could a belief in heaven as a reward for earthly suffering serve the interests of the ruling class?

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Marx believed that the promise of an afterlife in heaven could be used by the ruling class to pacify the working class and prevent them from demanding better treatment in this life. By convincing the lower classes that their suffering in this life would be rewarded in the afterlife, the ruling class could avoid having to address their grievances and maintain the status quo.

According to Karl Marx,how Could a Belief in Heaven as a Reward