On account of which moreover, since it was previously mentioned in the aforesaid consideration, namely, that “It is not licit for their successors to call again into doubt those things, which were defined once for all by the key of knowledge in faith or morals by the Supreme Pontiffs, although it is otherwise,” so they say, " in regards to those things, which have been ordained by the Supreme Pontiffs by [means of] the key of power," it is evidently clear from the following things [that] this is directly contrary to the truth. First, indeed following * these men, it is clear that the aforesaid assertors, who hold that the spiritual key is by no means knowledge, but a power of binding and loosing, by reckoning it to be knowledge, have erred.* In favor of which is the definition of the “key”, which is given by the doctors [of theology]: “The key is the special power of binding and loosing, with which the ecclesiastic as judge should receive the worthy into the Kingdom, and exclude the unworthy .” Likewise, since the keys, of which We speak, are conferred in the imposition of priestly orders, it is however well established that knowledge is not normally conferred upon the man ordained to the priesthood: wherefore, following [the argument of] these men, it seems that knowledge is not the key, but rather the ability to bind and loose should be said to be the key. Still following [the argument of] these men, they are evidently known to have erred, who reckon that one spiritual key is knowledge, and following [the argument of] these men, of which the authority to discern between [one] leper and another they assert to be a key, and the other [key is] the power of binding and loosing. **For they substitute, by means of keys of this kind concerning those things, which are of the faith, and other [things], the ability to define [a matter] by means of any constitution. However the keys, which are conferred in priestly orders, by no means extend themselves to such matters, because according to the aforementioned [assertions] simple priests would be able to issue a constitution, which is evidently false. *If however they maintain that those keys extend to the general authority, attributed to blessed Peter, and to his successors in the person of the same * in the entrusting of the pastoral office, by means of which it seems at least evident to themselves that they have conceded everything, without which one would be unable to exercise the care of the universal shepherd conveniently or exercise freely its office: besides it is clear that even they themselves have erred.