Prejudice
"Prejudices, it is well known, are most difficult to eradicate from the heart whose soil has never been loosened or fertilised by education; they grow there, firm as weeds among stones." - Charlotte Brontė, Jane Eyre
"I am free of all prejudices. I hate every one equally." - W. C. Fields
"A great many people think they are thinking when they are merely rearranging their prejudices." - William James