The fanatic is incorruptible: if he kills for an idea, he can just as well get himself killed for one; in either case, tyrant or martyr, he is a monster.
Cioran, E. M.
If you see one cold and vehement at the same time, set him down for a fanatic.
Lavater, Johann Kaspar
A fanatic is someone who does what the Lord would do, if He knew the facts of the matter.
Unknown
As any action or posture long continued will distort and disfigure the limbs; so the mind likewise is crippled and contracted by perpetual application to the same set of ideas.
Samuel Johnson
Of all things wisdom is the most terrified with epidemical fanaticism, because, of all enemies, it is that against which she is the least able to furnish any kind of resource.
Edmund Burke
In morals what begins in fear usually ends in wickedness; in religion what begins in fear usually ends in fanaticism. Fear, either as a principle or a motive, is the beginning of all evil.
Anna Jameson
A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.
Dr. Carl Sagan
If the freedom of religion, guaranteed to us by law in theory, can ever rise in practice under the overbearing inquisition of public opinion, then and only then will truth, prevail over fanaticism
Thomas Jefferson
The greatness of every mighty organization embodying an idea in this world lies in the religious fanaticism and intolerance with which, fanatically convinced of its own right, it intolerantly imposes its will against all others
Adolf Hitler
Though fanaticism drinks at many founts, its predisposing cause is mostly the subject of an invisible futurity.
Francis Atterbury