"Lord Dong is not the only man of power in the empire."
天下健者,豈唯董公?
Original text (Chinese)
Source, in full
Response in 189 to threats by Dong Zhuo. After this, Yuan Shao left the capital and began organising a coalition against Dong. This confrontation marked the end of the uneasy peace between the two. Source: "Xiandi Chunqiu" (獻帝春秋), page 190 of Sanguo Zhi (三國志).