《资治通鉴·晋纪·晋纪三十一》
高云平时沉稳敦厚，不善言谈，当时的人都不熟悉他，只有中卫将军长乐人冯跋觉得他的志向与气度极不一般，和他结为好友。
云沉厚寡言，时人莫知，惟中卫将军长乐冯跋奇其志度，与之为友。
Gao Yun was usually calm and composed and not good at talking. The people of the time were not familiar with him, but only Feng Ba, General of the Central Guards from Chang Le, judged from his ambitions and demeanor that he was no ordinary person and became his friend.