Comfort zones are bad, bad things.
I don't think there is anything more harmful to progress, than the comfort zone.
Oh they're necessary, I'm not denying that.
I'd go crazy if I didn't get to have a cup of hot chocolate or a burn around some corners every now and then.
But comfort zones are wily things, if you're not careful, they'll grab you tight. They'll literally suck the world away from you.
Stay vigilant. Watch your backs. (O_O)