Nothing is held by them in common, and there should be no occasion for the one to declare war upon the other.
Christ said that he and his disciples were not of this world.

S.Paul affirms that our city is in the heavens.

I take the word Church to signify an assembly of the faithful, not of priests only; for when we regard it as confined to those, it ceases to be Christ's kingdom, and becomes a portion of the commonwealth in this world, subject to the highest authority of State, as also are the laity.[136] This emphatic distinction between Church and State, both fulfilling the needs of humanity but in diverse relations, lay at the root of Sarpi's doctrine.
He regarded the claim of the Church to interfere in State management, not only as an infringement of the prince's prerogative, but also as patent rebellion against the law of God which had committed the temporal government of nations in sacred trust to secular rulers.

As the State has no call to meddle in the creation and promulgation of dogmas, or to impose its ordinances on the religious conscience of its subjects, so the Church has no right to tamper with affairs of government, to accumulate wealth and arrogate secular power, or to withdraw its ministers from the jurisdiction of the prince in matters which concern the operation of criminal and civil legislature.

The ultramontanism of the Jesuits appeared to him destructive of social order; but, more than this, he considered it as impious, as a deflection from the form of Christian economy, as a mischievous seduction of the Church into a slough of self-annihilating cupidity and concupiscence.
Sarpi's views seemed audacious in his own age.