Basically, Marx saw religion solely as a means whereby the ruling classes suppress ordinary people. Marx was correct that rulers use religion to discourage rebellion but this was clearly very much simplified. Egalitarian tribal hunter gatherer societies usually have religious or spiritual beliefs, hierarchical societies are not alone in this. Further those who want to fight the rulers in their society are likely to develop interpretations of religion that suggest their fight is virtuous, Liberation theology is an example. Karl Marx's most famous saying in its context, with emphasis added: