I just love this sentimental moment that Firestar has when he, Graystripe and Ravenpaw go to see what's going on in TigerClan:
His eyes were gleaming. Firestar guessed Ravenpaw was edited by the prospect of adventure. How different he was now from the nervous apprentice he had once been, bullied by his fierce mentor, Tigerclaw!
"All right," he meowed, trusting his instincts that it would be good to have Ravenpaw with them. "We'll be glad to have you."
As he bounded through the forest, his two oldest friends by his side, Firestar felt his mind flood with memories of how they had trained and hunted together as apprentices. For a short time he could almost imagine that those days had returned, that he had shed his responsibilities like falling leaves and was young and carefree again.

From The Prophecies Begin #6: The Darkest Hour