Antony Flew (1923-2010) 1 [T]o maintain any belief while dismissing, or refusing to give due weight to, reasonable and relevant objections is to show that you are more concerned to maintain that belief than really to know whether it or something else is, after all, true.

(Antony Flew, How to Think Straight: An Introduction to Critical Reasoning, 2d ed. [Amherst, NY: Prometheus Books, 1998], 140)

Note from KBJ: See the post just previous to this one for an example of a True Believer.