Just at the very end after the Scouring, when Saruman is Sharky.

Ah right. Though I'm not sure we can really take Saruman's comments at that time at face value--he comments on how Frodo has changed but that's also from the perspective of his own very changed position. Frodo had changed quite a lot. But I'm not sure if kicking Saruman's ass really constitutes being wise and cruel. Pre-quest Frodo might have done that, too. Anyone might do that.