《孟子·告子章句上·第二节》
如今的水，被击打就可以溅得很高，可以使它高过额头；堵塞水道使它倒行，就可以使它流上山岗。
今夫水，搏而跃之，可使过颡；激而行之，可使在山。
Nowadays, water can be splashed high when it is hit, and it can be made higher than the forehead; when water is blocked and made to flow backwards, it can be made to flow up the hillside.