Possible Clues:

• Zealotry
• Initiator of frenzy — maniac's maddened with it
• Maniacs fit to bust — displaying this
• Santayana defines it as "redoubling your effort when you have forgotten your aim"
• Within such, the madness of maniac fits?
• Zeal whipped up maniac's fit
• Can a misfit develop excessive enthusiasm?
• Excessive zeal
• Cooler Athenian expression heard to display irrational enthusiasm