Talik was a big, robust youth who loved to get in scraps. He left home at a tender age, figuring one less mouth to feed was the best thing he could do for his family, and joined the army. He figured the army to be the perfect path to fortune and glory, or at least an excuse to bust some heads and get paid for it.
But the Last War was not at all what he had imagined. The horrors of real warfare sobered him quickly. Though the war ended mere months after he entered it, Talik was forever changed. Discharged with a pat on the back and 10 gold pieces in his pocket, he wandered around Sharn for nearly two years. He did odd jobs and drank most of his wages, trying to forget what he had seen. He would likely have wound up at the end of some thug's knife for the coppers in his pocket except for one event. At an especially desperate moment, he committed his first real crime: a mugging. At least he tried to. His "victim" effortlessly evaded Talik's attacks and swiftly bound the young man in his own shirt. That wasn't what impressed Talik, though. He had seen plenty of good fighters. What amazed him was that after the man pinned him to the ground he leaned into Talik's face and...smiled. He pressed a few silvers into Talik's palm and said, "come to the temple of the White Rose at sundown. I would speak with you."
The man left and Talik, after extricating himself, sat down and had a good think. He did go to the temple, where the monks took him in and showed him the way of peace.
Talik is now a newly-minted acolyte of the White Rose. Though he is not naive enough to believe in total non-violence, he has sworn to always seek the peaceful path whenever possible, and try to bring peace to his fellows.
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As I said, I don't know Eberron, but I'm picturing the Temple of the White Rose as a combination monastery, hospital and community outreach center in a poor part of Sharn. People trained there would be clerics and/or monks in game terms (or more likely Experts if I understand Eberron correctly). The temple is dedicated to a philosophy of non-violence and does not worship any particular deities.
I was purposely vague about what country he's from for two reasons: I don't know Eberron much, and it's really not important to Talik. He considers patriotism a disease.