It comes from an uncharacteristically jovial Vulcan and it goes something like this:
"Mastery of emotions is more challenging than their eradication, and of the two it's a greater victory"

Could someone please help identify the source? It's been driving me crazy.

Thank you!

Alec

Cthia is the name of the band, they turn up in Symphony 3, Movement 4 (Coming to Terms).

The specific quote is from the next story in that Symphony (End of the Tour)

“Cthia,” he said, “is about recognizing the truth in the world around oneself.” Applause; the line had been used in many concerts before and was recognized by the fans in the audience. “It is also about recognizing the truth in oneself.” Silence; the audience recognized now that the usual oh-so-Vulcan routine wasn’t happening this time. “For seven years we have attempted to present the truth about Vulcan by presenting a lie about ourselves. We feel now that the message has been delivered, but for those who did not hear, it is this: The Way of Surak, as it is practiced by most Vulcans, is incomplete. Surak taught the mastery of passions, not their eradication... and of the two, mastery is the greater victory.”