In certainty of knowing, faith falls short of proper knowledge
So with respect to the certainty we have called the certainty of speculation, or of knowing, faith is not more certain than knowledge in the proper sense; rather, it is surpassed by that knowledge in this kind of certainty.
For the greater this certainty is, the further it removes all doubt from assent. But faith is more exposed to doubt than knowledge is, mathematical knowledge for example.
If someone has grasped the force of a geometrical demonstration, he cannot doubt its conclusion even for a moment. But the believer must often wrestle with doubt and distrust, which assail his faith.
Latin
XXXIII. Igitur respectu certitudinis illius, quam speculationis, seu cognitionis diximus, fides non est certior scientia proprie dicta; sed ab illa potius certitudine superatur. Etenim quo major ista certitudo, eo longius ab assensu removet omnem dubitationem. Sed fides dubitationi magis est obnoxia quam scientiae, verbi causa Mathematicae. Nam si quis perceptam habet vim demonstrationis alicujus Geometricae, de conclusione tantisper dubitare non potest. Sed fideli saepe luctandum est cum dubitatione atque diffidentia, quibus fides ejus impetitur.