Religious leaders have used the idea of Idolatry (literal worship of statues or images) as a metaphor. They call anything that comes ahead of God an Idol. Saint Paul writes that "covetousness" (wanting material things) is idolatry. Jesus preached that "you cannot serve God and Mammon". Mammon was the Syrian God of riches. Muslim writers warn of making idols of material things or even political ideologies. Eastern religions have also warned about making material things one's god.