From the 1559 Institutes 3.19.15 (Battles edition)
Therefore, in order that none of us may stumble on that stone, let us first consider that there is a twofold government in man (duplex esse in homine regimen): one aspect is spiritual, whereby the conscience is instructed in piety and in reverencing God; the second is political, whereby man is educated for the duties of humanity and citizenship that must be maintained among men. These are usually called the “spiritual” and the “temporal” jurisdiction (not improper terms) by which is meant that the former sort of government pertains to the life of the soul, while the latter has to do with the concerns of the present life—not only with food and clothing but with laying down laws whereby a man may live his life among other men holily, honorably, and temperately. For the former resides in the inner mind, while the latter regulates only outward behavior. The one we may call the spiritual kingdom, the other, the political kingdom. Now these two, as we have divided them, must always be examined separately; and while one is being considered, we must call away and turn aside the mind from thinking about the other. There are in man, so to speak, two worlds, over which different kings and different laws have authority.