There are many instances in history of people who allow their skepticism to cut the nerve of moral effort, and there are numerous people, on the other hand, who are fierce crusaders at the price of fanaticism. In his political commitments the fanatic makes claims for his particular case which cannot be validated by either a transcendent Providence or a neutral posterity.
Elton Trueblood, Abraham Lincoln: Lessons in Spiritual Leadership
arrogance, fanaticism, fundamentalism