As the story progresses and Candide matures, he does not seem to have the same optimistic beliefs that he had during the beginning

Starting to doubts

If this is the best of possible worlds, what then are the others? Well, if I had been only whipped I could put up with it, for I experienced that among the Bulgarians; but oh, my dear Pangloss! thou greatest of philosophers, that I should have seen you hanged, without knowing for what! Oh, my dear Anabaptist, thou best of men, that thou should‘st have been drowned in the very harbour! Oh, Miss Cunegonde, thou pearl of girls! that thou should’st have had thy belly ripped open!”  (Voltaire 13-14)