As he puts it, To enforce the exclusion of religion from politics, or from public life more generally, violates the First Amendment guarantee of the “free exercise of religion.” The free exercise of religion is the reason for the separation of church and state—a principle that aims not at protecting the state from religion but at protecting religion from the state.
In the First Amendment, religious freedom is of a piece with, indeed is in the very same sentence with, free speech, free press, free assembly, and the right to challenge government policy.
...What do we mean by politics? I believe the best brief answer is proposed by Aristotle. Aristotle teaches that politics is free persons deliberating the question “How ought we to order our life together?” The ought in that definition indicates that politics is in its very nature, if not always in its practice, a moral enterprise. The very vocabulary of political debate is inescapably moral: What is just? What is unjust? What is fair? What is unfair? What serves the common good? On these questions we all have convictions, and they are moral convictions.
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