《庄子·外篇·秋水》
夏禹时代十年里有九年水涝，而海水不会因此增多;商汤的时代八年里有七年大旱，而岸边的水位不会因此下降。
禹之时，十年九潦，而水弗为加益；汤之时，八年七旱，而崖不为加损。
In the Xia Dynasty, there were nine years of flood in ten years, but the sea water did not increase because of this; in the Shang Dynasty, there were seven years of drought in eight years, but the water level on the coast did not decrease because of this.