《太平广记·卷三百八十二·再生八》
看见地上有一口井，井深三四丈，井里的砖一点缝隙没有。他心想，这个井是自然的，井边有个人对他说： 不是自然的，怎能成为井？ 
见平地有一井，深三四丈，砖无隙际，衡心念言，此井自然。井边有人谓曰： 不自然者，何得成井？ 
Seeing a well in the ground, three to four zhang deep, not a single brick in the well had any gaps. He thought to himself, this well is natural, and a person next to the well said to him: if it is not natural, how could it become a well?