Rolin-Jaequemyns' contract specified two functions. First he was to assist the Siamese government to modernize and codify the country's body of laws; and second, he was to serve as an advisor concerning foreign affairs. His position held no formal power. In his words, the position of General Advisor has "no means to enforce his advice except by persuasion. Of course he cannot pretend to persuade always nor all at once, and he has to get accustomed to a perfect practice of patience."