premise: After the more sober spirituality of the Romanesque churches, the soaring Gothic cathedrals of Chartres, Paris (Notre-Dame), Bourges, and Amiens were at once monuments to the glory of God and testimony to the sheer power, spiritual and temporal, of the Roman Catholic Church.
hypothesis: Chartres, Paris, Bourges and Amines' cathedrals were monuments to the glory of God and, at the same time, testimony to sheer power of the Roman Catholic Church.