Indeed, from The End of Time:
Wilf: "But Doctor, I've heard you talk about your people and how great they were."
Doctor: "That's how I choose to remember them, as the Time Lords of old. But then they went to war, and it changed them."
I alos like this quote from The Sound of Drums. Although technically about Gallifrey, it can also be applied to the Time Lords and their society:
Jack: "All the legends I've heard about Gallifrey made it sound so perfect."
Doctor: "Perfect to look at, maybe. And it was..."