If you've got an hour and an online audio player, listen to episode #304 of the radio show This American Life.
This episode, entitled "Heretics," first broadcast on December 16, 2005. I heard it for the first time last week. (The link leads away from LSTC-land, and all support that implies.)
To paraphrase one of my professors, a heretic isn't someone trying to tear apart the church. A heretic is someone who deeply loves God and is trying to be faithful - but goes a step further.
If nothing else, a heretic has to be brave. Or foolhardy. Could you or I do that for our convictions?