"It is difficult for an individual to decide—as he might decide some morning, say, not to shave—to be rational (reasonable) rather than to remain prejudiced. Prejudices are rooted in such deep feelings that it does not occur to us to question them. ...on matters that involve his deeply held prejudices he is not likely to struggle. ...since he is unaware of a problem, he confronts no tension or conflict. He feels no need to struggle. ...The cultural environment which gives rise to prejudices does not usually provide the conditions that call them into question. The cultural mind... is often closed; it may always be closed on specific beliefs."