《论衡·卷三·本性篇》
告子跟孟子同一个时代，他评论人性没有善恶的区分，就像湍流着的水，挖个缺口使它向东就向东流，挖个缺口使它向西就向西流。水本来没有向东流向西流的区分，就像人性没有善恶区分一样。
告子与孟生同时，其论性无善恶之分，譬之湍水，决之东则东，决之西则西，夫水无分於东西，犹人无分於善恶也。
Gao Zi lived in the same era as Mencius, and he commented that human nature does not have the distinction between good and evil, like water flowing in a turbulent stream. If you dig a gap for it to flow east, it will flow east. If you dig a gap for it to flow west, it will flow west. Water originally does not have the distinction of flowing east or flowing west, just like human nature does not have the distinction between good and evil. 