liberalism as a 'felix culpa'

​   Epistemologically, on this view, the Church must be understood a vast complexio oppositorum, in which the challenge of individual reason to the Church’s infallibility is itself subsumed as an indispensable part of the providential design. In this way (to end where we began) Newman believes that “our enemy is turned into a friend ... he does just so much as is beneficial, and is then removed.” This is perhaps the most elegant exemplar of the species of argument I have tried to uncover here, the vision of liberalism as a felix culpa.

Here.