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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Karl Marx believed that the ruling class used religion, including the belief in an afterlife, to keep the lower classes content with their current suffering and prevent them from demanding better treatment in this life. By accepting their earthly misery and believing in a future reward, the working classes were less likely to challenge the social and economic systems that benefited the ruling class.

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