Nakae Tōju (中江 藤樹, 21 April 1608 – 11 October 1648) was a Japanese philosopher and writer known as "the sage of Ōmi". Nakae was a feudal retainer who lived during the Tokugawa shogunate. He taught that the highest virtue was filial piety (kō), and acted upon this, giving up his official post in 1634 in order to return to his home in Takashima, Ōmi to care of his mother. He distinguished, however, between sho-kō and dai-kō: lesser and greater filial piety. Sho-kō involves the normal care owed by children to their parents; dai-kō involves the notion that our human parents are themselves the children of the divine parents — thus, if one's parents are wrong, then one should encourage them to return to virtue.