Pope Alexander VII wrote one of the most authoritative docuмents related to the heliocentrism issue. He published his Index Librorum Prohibitorum Alexandri VII Pontificis Maximi jussu editus which presented anew the contents of the Index of Forbidden Books which had condemned the works of Copernicus and Galileo. According to Rev. William Roberts, he prefaced this with the bull Speculatores Domus Israel, stating his reasons: "in order that the whole history of each case may be known." 'For this purpose,' the Pontiff stated, 'we have caused the Tridentine and Clementine Indices to be added to this general Index, and also all the relevant decrees up to the present time, that have been issued since the Index of our predecessor Clement, that nothing profitable to the faithful interested in such matters might seem omitted."[33] Among those included were the previous decrees placing various heliocentric works on the Index" ("...which should be considered as though it were inserted in these presents, together with all, and singular, the things contained therein...") and using his Apostolic authority he bound the faithful to its contents ("...and approve with Apostolic authority by the tenor of these presents, and: command and enjoin all persons everywhere to yield this Index a constant and complete obedience...")[34] Thus, Alexander turned definitively against the heliocentric view of the solar system.