Henry Thomas Buckle Quote

If you can impress any man with an absorbing conviction of the supreme importance of some moral or religious doctrine; if you can make him believe that those who reject that doctrine are doomed to eternal perdition; if you then give that man power, and by means of his ignorance blind him to the ulterior consequences of his own act,-he will infallibly persecute those who deny his doctrine.

History of Civilization in England (ed. 1872)