《元史·列传·卷十一》
沿途暗暗记下地理形势之险夷，城郭人民的强弱，复命时详述这一切，并献出所怀金杯以表示他的勇谋。
速哥虽佯为不智，而默识其地理厄塞、城郭人民之强弱。既复命，备以虚实告，且以所怀金卮献。
Along the way, he secretly memorized the geographical terrain, the strengths and weaknesses of the city and the people, and recounted all this in detail when he reported back, and offered the golden cup he was carrying to show his courage and resourcefulness.