What, finally, are the functions of reason and rationality in human behaviors? They are the functions, respectively, of the prince's tutor and his councilor. The tutor teaches the prince to promote the public good in the long term. The councilor tells him how to act in order to achieve his goals, whatever they might be, in the most efficient way. It is not incumbent upon the councilor to impose the demands of reason; but if the tutor has done his job well, the prince will make them his own.

Reason and Rationality (2009)