Investigate things to extend knowledge.
格物致知。

Philosophers
Zhu Xi
Southern Song Confucian (1130-1200), the systematizer of Neo-Confucianism. His Four Books commentaries served as China's civil-service exam basis from 1313 to 1905, shaping East Asia's governing class for six centuries.
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Zhu Xi's Other Quotes
Related Quotes
You must learn all things: both the steadfast heart of well-rounded Truth and the opinions of mortals, in which there is no true trust.
-- Parmenides
For thinking and Being are the same.
-- Parmenides
Those who understand that things arise dependently know them to be empty.
-- Nagarjuna
Blue dye is extracted from the indigo plant, yet it is bluer than indigo itself.
-- Xunzi
Learning must never cease.
-- Xunzi
Knowing is the beginning of action; action is the completion of knowing.
-- Wang Yangming