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110 man, that he should not use diligent attention in seeking truth, and yet to do so should entirely give himself to the work, and, though his error be inculpable, nevertheless fall into error. But even inculpable error is far from the Church of God, as we have proved in a former book. Which fact is an abundant argument that neither Pontiff nor Council has omitted, in deliberation, any necessary thing.' 'Let us therefore grant that to the Judges constituted by God in the Church, none of those things can be wanting which are necessary for a right and true judgment.'

Cerboni, a theologian of the Dominican order, says:

'When once anything of faith has been defined by the Supreme Pontiff, it is not permitted to doubt whether he has used all diligence before such definition.'