The capacity of the rational mind to deceive, manipulate, scheme, trick, falsify, minimize, mislead, betray, prevaricate, deny, omit, rationalize, bias, exaggerate and obscure is so endless, so remarkable, that centuries of pre-scientific thought, concentrating on clarifying the nature of moral endeavour, regarded it as positively demonic. This is not because of rationality itself, as a process. That process can produce clarity and progress. It is because rationality is subject to the single worst temptation—to raise what it knows now to the status of an absolute.
