Roger Williams, "The Bloudy Tenet of Persecution" (1644)

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First, that the blood of so many hundred thousand souls of Protestants and Papists, spilt in the wars of present and former ages, for their respective consciences, is not required nor accepted by Jesus Christ the Prince of Peace....
Fifthly, all civil states with their officers of justice in their respective constitutions and administrations are proved essentially civil, and therefore not judges, governors, or defenders of the spiritual or Christian state and worship....
Sixthly, it is the will and command of God that (since the coming of his Son the Lord Jesus) a permission of the most paganish, Jewish, Turkish, or antichristian consciences and worships, be granted to all men in all nations and countries; and they are only to be fought against with that sword which is only (in soul matters) able to conquer, to wit, the sword of God's Spirit, the Word of God. 
Eighthly, God requireth not a uniformity of religion to be enacted and enforced in any civil state; which enforced uniformity (sooner or later) is the greatest occasion of civil war, ravishing of conscience, persecution of Christ Jesus in his servants, and of the hypocrisy and destruction of millions of souls.
Ninthly, in holding an enforced uniformity of religion in a civil state, we must necessarily disclaim our desires and hopes of the Jew's conversion to Christ.
Tenthly, an enforced uniformity of religion throughout a nation or civil state, confounds the civil and religious, denies the principles of Christianity and civility, and that Jesus Christ is come in the flesh....
Twelfthly, lastly, true civility and Christianity may both flourish in a state or kingdom, notwithstanding the permission of divers and contrary consciences, either of Jew or Gentile.... 
To batter down idolatry, false worship, heresy, schism, blindness, hardness, out of the soul and spirit, it is vain, improper, and unsuitable to bring those weapons which are used by persecutors, stocks, whips, prisons, swords, gibbets, stakes, etc. (where these seem to prevail with some cities or kingdoms, a stronger force sets up again, what a weaker pull'd down), but against these spiritual strongholds in the souls of men, spiritual artillery and weapons are proper, which are mighty through God to subdue and bring under the very thought to obedience, or else to bind fast the soul with chains of darkness, and lock it up in the prison of unbelief and hardness to eternity....

God needeth not the help of a material sword of steel to assist the sword of the Spirit in the affairs of conscience, to those men, those magistrates, yea that commonwealth which makes such magistrates, must needs have power and authority from Christ Jesus to fit judge and to determine in all the great controversies concerning doctrine, discipline, government, etc. And then I ask whether upon this ground it must not evidently follow that:
Either there is no lawful commonwealth nor civil state of men in the world, which is not qualified with this spiritual discerning (and then also that the very commonweal hath more light concerning the church of Christ than the church itself). Or, that the commonweal and magistrates thereof must judge and punish as they are persuaded in their own belief and conscience (be their conscience paganish, Turkish, or antichristian) what is this but to confound heaven and earth together, and not only to take away the being of Christianity out of the world, but to take away all civility, and the world out of the world, and to lay all upon heaps of confusion?