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In page Freedom of religion:

"

Adam Smith, in his book The Wealth of Nations (using an argument first put forward by his friend and contemporary David Hume), states that in the long run it is in the best interests of society as a whole and the civil magistrate (government) in particular to allow people to freely choose their own religion, as it helps prevent civil unrest and reduces intolerance. So long as there are enough religions and/or religious sects operating freely in a society then they are all compelled to moderate their more controversial and violent teachings, so as to be more appealing to more people and so have an easier time attracting new converts. It is this free competition amongst religious sects for converts that ensures stability and tranquillity in the long run.[citation needed]