Any serious attempt to define and to classify forms of consciousness will act as a "red flag" waved in the face of many critics. The effort to define accurately and to classify in any detail is bound, they will urge, to result in a conservative clinging to conclusions once reached and in a love of schedules and schemes for their own sake. The system maker, they will insist, is likely to subordinate the facts to his classification and to cut down the truth to the measure of his framework.
— MARY WHITON CALKINS