Discovered the theme of periagoge, turning around, conversion, in Book VII of Plato's Republic (518d).
Voegelin insists of course that we must not exaggerate the meaning of this periagoge with Christian religious overtones. (Plato, Columbia, Missouri: Univ. of Missouri Press, 2000, 115; see http://books.google.co.in)
Still, what I am thinking of is Lonergan and the way he used the word conversion: intellectual conversion (ex umbris et imaginibus... I thought that was Newman, but it was perhaps Newman quoting Plato), moral conversion, religious conversion.