Acquiring a volition flame is both the worst and the best thing that could happen to someone in their lifetime. However, almost 100% of the time, a volition flame never appeared inside an adult. It only appeared in children, yet the chances of that happening were extremely low.
Silas had many theories as to why a volition flame could appear within a person's soul, but he thought one theory was the most accurate.
A volition flame only appeared within children who suffered from a young age, and even then, not only did they have to suffer a great deal, but there also seemed to be a few more factors that go into play.
Silas got his second volition flame when he had almost died, giving him the hunger for battle that he didn't have previously.
His first volition flame... Well, that was a story for another time.