Tolstoy

"I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives."
—Leo Tolstoy (1828 - 1910)

"The blackest billingsgate, the most ungentlemanly insolence, the most yahooist brutality, is patently endured, countenanced, propagated, and applauded. But touch a solemn truth in collision with the dogma of a sect, though capable of the clearest proof, and you will soon find you have disturbed a nest, and the hornets will swarm about your eyes and hand, and fly into your face and eyes."
John Adams