Perspective of Rationality: Viewed from "The Doctrine of the Mean"

Ancient Greek sages studied practical rationality and modern European thinkers probe into instrument rationality and new practical rationality,while Western philosophers research rationality.All these bring revelation to the contemporary world: Instrument rationality can probably lead to the destruction of mankind.Yet,practical rationality with balance as its standard,can make up for the deficiency of instrument rationality from the aspect of morals and instrument rationality so as to prevent it from being excessively spread without restriction.