A prejudice may be an unreasoned judgment, he [Hibben] pointed out, but an unreasoned judgment is not necessarily an illogical judgment. … First, there are those judgments whose verification has simply dropped out of memory. … The second type of unreasoned judgments we hold is the opinions we adopt from others … The third class of judgments in Professor Hibben's list comprises those which have subconscious origin. The material that furnishes their support does not reach the focal point of consciousness, but psychology insists upon its existence.

Life without prejudice, pp. 8-9. - Life Without Prejudice (1965)