Core pair in Confucian and Neo-Confucian thought. Zhu Xi (
朱熹, Zhū Xī, Song dynasty) held that
知 (knowing) precedes
行 (acting); Ming-dynasty philosopher Wang Yangming (
王阳明, Wáng Yángmíng) reversed this with his famous doctrine
知行合一 (zhī xíng héyī, 'unity of knowledge and action') — true knowing IS acting.