You are deeply passionate about a few things in your life. Everything else, you couldn't care less about. Your passions tend to hold steady over time. If anything, they intensify. Once you hold on to something (or someone), you don't let go!
You are focused, single minded, and intense.
You don't let others see your intensity often, and when they do, they are quite surprised.
You burn brightly, but you also burn steadily.
You have the endurance to get the one thing you desire most.