Oemar Said Tjokroaminoto's famous quote was "Highest education, purest tahud, smartest strategies." and he was the first to refuse to submit to the Netherlands as he became one of the leaders of Syarekat Dagang Islam (Islamic Trade Union) cooperative which later evolved into Sarekat Islam nationalist political organization.
One of his most famous quotes was "Highest education, purest tauhid, smartest of strategies" (Indonesian: Setinggi-tinggi ilmu, semurni-murni tauhid, sepintar-pintar siasat), depicting the atmosphere of Indonesian struggle in its time which required the three aforementioned abilities of a freedom fighter. He was the first to refuse to submit to the Netherlands. Its chairman was H. Samanhudi, while Tjokroaminoto became chairman. At Tjokroaminoto's suggestion, the word trade (Indonesian: dagang) in the organization's name was removed and SDI became Sarekat Islam (SI) or the Islamic Union. Samanhudi had founded Sarekat Dagang Islam (SDI) or the Islamic Trade Union, in late 1911, in Surakarta. They are active as political Islamic movement. 
