《论衡·卷十六·讲瑞篇》
山顶上的溪流，与江湖不相连接，然而溪中有鱼，这是水中的精气自然产生的。
山顶之溪，不通江湖，然而有鱼，水精自为之也。
The stream on the top of the mountain is not connected to the rivers and lakes, but there are fish in the stream. This is because the spiritual energy in the water has naturally produced them.